Mopar 326 Engine Specs

Intro

The Mopar A/Poly 326 is the one-year Dodge oddball that proves Chrysler could make even a simple displacement number need adult supervision. It belongs to the A-block polyspherical V8 family, separate from the familiar Plymouth 318, later LA small-block, and older Dodge Red Ram 325 Hemi/Poly family. For 1959, Dodge used an A/Poly-based engine with an actual displacement around 325 cubic inches and marketed it as a 326 so nobody would confuse it with the older Dodge 325. Naturally, that means everybody still gets confused.

That’s the first job of this engine: clean up the name. The 326 wasn’t Pontiac’s later 326, not a Chrysler Hemi, not a DeSoto Poly, and not a 318 with the tag changed because the salesman got bored. It used the Plymouth-style A/Poly architecture, but Dodge gave it the largest bore of the A-engine group at 3.95 inches while keeping the common 3.31-inch stroke. Same Poly nickname doesn’t prove the family. Same Dodge badge doesn’t mean the older Red Ram parts are invited.

Dodge needed the 326 because its old Dodge Hemi/Poly line was done, and the division still needed a V8 for cars like the 1959 Coronet. Chrysler’s A/Poly architecture gave Dodge a practical answer without keeping the old Dodge-specific engine family alive. That’s not glamorous, but it’s exactly the kind of corporate engine move that keeps cars in production and parts departments muttering under fluorescent lights.

In normal use, the 326 was a Dodge passenger-car engine, not a factory performance legend. It offered solid displacement, hydraulic lifters, and enough torque for late-1950s Dodge duty, but it didn’t hang around long enough to become a household Mopar name. Its job was transitional: give Dodge a modern Poly V8 after the old Dodge engine family faded and before later small-block stories got easier to remember.

The plain-English identity is this: the Mopar A/Poly 326 is a 1959 Dodge-only A-block Poly V8, created by boring the A-engine layout larger and naming it carefully enough to create confusion anyway. It’s not a Red Ram 325, not an LA 318, and not a hidden performance prize. It’s a short-lived Dodge bridge engine with its own parts logic, and the number alone won’t save anybody at the counter.

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Overview

The Mopar A/Poly 326 sits at the edge of the A-block Poly family, and that’s why it’s easy to misread. Plymouth had already used the A/Poly layout in several early displacements, but the 326 was a Dodge-specific 1959 piece. It used the A-engine foundation after Dodge’s earlier Hemi/Poly-based Red Ram family had run its course. That makes the 326 part of the A/Poly story, but not just another Plymouth displacement with a different air cleaner.

Architecturally, the 326 stayed in A/Poly territory. It used polyspherical heads and the A-engine layout, not true Hemi chambers and not the older Dodge Red Ram block family. The 3.95-inch bore was the largest used in the A-engine group, while the 3.31-inch stroke tied it to the 318-style A/Poly bottom-end family. That large bore gave Dodge its own nominal displacement without reviving the retired 325 name. The hardware wasn’t confused. The marketing department just handed everyone a loaded wrench.

The 326’s name exists because Chrysler wanted distance from the earlier Dodge 325. Its actual displacement was close enough to 325 cubic inches that calling it another 325 would’ve been asking for chaos. So Dodge called it 326, which helped just enough to give future parts guys a different headache. That’s old Mopar naming in one sentence: technically reasonable, historically annoying.

In real use, the 326 was built for 1959 Dodge passenger-car work, especially Coronet duty. It wasn’t a Fury dual-quad image engine, wasn’t a Chrysler Hemi, and wasn’t a future LA wedge. It was a practical V8 meant to power full-size Dodges with smoother modern performance and enough torque for regular driving. Hydraulic lifters also separated it from earlier solid-lifter A engines and made it a little more suited to quiet, normal passenger-car use.

That doesn’t make it dull. It makes it specific. The 326 shows Dodge moving away from its own earlier Hemi-derived engine family and into the shared corporate A/Poly world. Chrysler was consolidating engine strategy, trimming division-specific dead ends, and finding ways to keep each brand supplied without reinventing every block every few years. The 326 is one of those corporate-transition engines that looks odd only because the family tree is being pruned while you’re watching.

A 326 Dodge Poly belongs in a very specific lane: not Dodge Red Ram 325, not Plymouth 318 Poly, not Pontiac 326, not LA 318, and not a Hemi cousin just because the valve covers look old and complicated. Bore, stroke, block family, heads, lifters, year, and application decide what’s actually there. If somebody orders parts by badge memory, the engine will sit there quietly while the boxes pile up wrong.

Compared with the 318 Poly, the 326 is rarer, shorter-lived, and more Dodge-specific. Compared with the earlier Dodge 325, it belongs to a different engine family even though the displacement is annoyingly close. Compared with the later LA engines, it’s older A/Poly hardware with different heads and different parts logic. That’s the whole lesson: same division, similar number, different engine.

The Mopar A/Poly 326’s real place is as the one-year Dodge A/Poly transition engine: useful, obscure, and easy to misidentify if a person thinks displacement names tell the whole truth. Respect it as a 1959 Dodge A-engine Poly, and it makes sense. Misname it at the parts counter, and you’ll get a box full of confidence that doesn’t bolt to anything.

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What makes it different

The Dodge A/Poly 326 is the oddball Dodge Poly that looks like it wandered into the Plymouth A-engine family wearing a Red Ram name tag. Keep the identity fenced in: close to the 318 family, larger-bore than the 313, separate from LA small blocks, and outside the older Dodge Hemi/Poly family no matter what the nameplate fog suggests. The 326 is the 1959 Dodge A/Poly with extra bore and a narrow job, not a performance legend waiting for a salesman to polish it.

Compared with the A/Poly 318, the 326 is the bigger-bore cousin with a much shorter story. Same basic A-engine Poly direction, same 3.3125-inch stroke, but more bore and a Dodge-specific reason for being there. The 318 became the familiar survivor: broader use, longer life, better recognition, and more parts knowledge floating around. The 326 stayed in its one-year Dodge lane, which makes “basically a 318” too lazy for anything involving pistons, rings, or money.

Compared with the 313, the 326 is bigger and more Dodge-specific, but the warning stays familiar: close Poly numbers don’t make engines interchangeable. The 313 lives mostly in Canadian and export conversations. The 326 lives in the 1959 Dodge lane. Both sit near the 318 in family logic, and both can get blurred by people who want the parts counter to be simpler than the engine. Bore, market, year, and actual hardware still get a vote.

Compared with the early 277, 301, and 303 A/Poly engines, the 326 belongs to a later Dodge transition moment, not Plymouth’s first V8 steps. The 277 opened the Plymouth V8 door. The 301 stretched the idea. The 303 brought Fury shine. The 326 arrived after Dodge’s older engine line had already created a naming mess. Treat it like early Plymouth launch history and you’ll miss the Dodge-specific confusion sitting right in front of you.

Compared with the LA small blocks — 273, 318, 340, and 360 — the 326 needs the usual Poly warning sign, only with Dodge fog smeared on the glass. The LA engines are later wedge-head small blocks. The 326 is A/Poly hardware with Poly heads, Poly intake needs, Poly valvetrain pieces, and early parts rules. It isn’t an LA 318 with a little extra bore and a better story. If the parts order starts with “small-block Mopar” and nobody says Poly, stop before the boxes start teaching lessons.

Compared with Dodge’s older Hemi and Poly engines, the 326 is where Red Ram language can get stupid fast. Dodge used Red Ram identity around earlier Dodge engines, then ended up with this A/Poly-based 326 in 1959. That doesn’t make it the same block family. Dodge Hemi parts don’t get invited because the badge sounds familiar. Names can move around faster than cast iron. The block is the witness, not the badge.

The 326 A/Poly makes sense when 1959 Dodge correctness matters. In the right Coronet or Dodge application, it belongs because it’s part of that specific transition moment. Outside that lane, it’s a narrow oddball: interesting, usable, and worth preserving when correct, but not the engine to pick for easy horsepower, common LA parts, or lazy 318 assumptions.

That’s the 326’s place. It’s the Dodge-specific A/Poly with more bore than the 318, less recognition than the 318, and enough Red Ram/nameplate fog to make casual buyers dangerous to themselves. Preserve it when the car deserves the right engine. Verify the family, year, bore, and hardware before ordering parts. And don’t let Dodge naming history do the casting numbers’ job.

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General Specs

Displacement	326 cu in / 5.3L nominal; actual displacement approximately 325 cu in	Bore / Stroke	3.950 in × 3.3125 in
Production / Use Era	1959 Dodge A-block Poly passenger-car use	Bore Spacing	4.460 in
Engine Family	Chrysler / Plymouth A-series Poly small-block V8	Deck Height	9.603 in A-block baseline
Block Material	Cast iron	Rod Length	6.123 in A-block baseline
Cylinder Head Material	Cast iron	Main Journal	2.500 in
Factory Rating	255 hp / 350 lb-ft, commonly listed 1959 Dodge 2-barrel version	Compression Ratio	Market/tune dependent; verify by exact application
Fuel / Induction	Gasoline; carbureted, 2-barrel	Rod Journal	2.125 in
Cam Location	In-block camshaft	Main Bearings	5
Valve Layout	OHV / pushrod, 2 valves per cylinder; polyspherical chambers with canted valves	Firing Order	1-8-4-3-6-5-7-2
Lifter Type	Hydraulic lifters commonly associated with 1959 326 use	Distributor Rotation	Clockwise
Common Main Caps	2-bolt	Rear Main Seal	2-piece
Balance	Internal balance	Weight	~525–575 lb complete iron A-block Poly, depending on accessories/configuration
Dimensions	~29H / ~28W / ~30L	Primary Identity Check	1959 Dodge A/Poly; verify bore, castings, stampings, lifter setup, and application

Verify the block, bore, stroke, crank, heads, intake, carburetor, lifter setup, exhaust, stampings, and vehicle application before ordering parts. The 326 sits close enough to the 318 Poly and older Dodge 325 name to invite lazy assumptions, and far enough away to punish them when the boxes show up wrong.

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Variants

The 326 Poly doesn’t need a giant variant maze. It needs a tight fence around one narrow story: the 1959 Dodge A-series Poly. This isn’t the familiar 318 Poly, not the later LA 318, not the older Dodge Red Ram 325 Hemi / Poly family, and not some secret performance engine hiding under a displacement number with stage fright.

The useful split is simple: the 1959 Dodge 326 itself, the Red Ram name confusion, the 318 Poly / overbore confusion, and the service / swap / identification mess that follows a one-year oddball after decades of owner memory and parts movement. That’s enough. Don’t build fake subfamilies where Dodge mostly built one short-lived answer.

1959 Dodge 326 Poly

The 326 Poly belongs mainly to 1959 Dodge passenger-car use, including the Coronet story. It used the A-series Poly architecture, a 3.950-inch bore, and a 3.3125-inch stroke. That made it the largest-bore A/Poly displacement in this group, but the Geezer isn’t letting “largest” turn into “legendary” without a fight.

The factory name matters because Dodge was trying to keep this engine separate from the older Dodge 325 family. The actual displacement is close enough to 325 cubic inches to make the naming look like a paperwork trick, but the family is the real point. This 326 is A/Poly architecture, not the earlier Dodge Hemi-based Red Ram world.

In the right 1959 Dodge, the 326 can be a correct and interesting engine. It gives the car its proper one-year Dodge identity, and that’s worth preserving when the hardware and paperwork agree. It just doesn’t become a race package, Hemi cousin, big-block substitute, or high-dollar mystery prize because the number sounds uncommon.

A real 326 claim needs the engine to prove itself. Bore, stroke, casting information, stampings, heads, intake, carburetion, lifter setup, application, and vehicle context all need to agree. A Dodge with a 326 story is interesting. A loose A-series Poly with somebody saying “I think it’s the big one” is homework with greasy fingerprints.

Red Ram Name Confusion

The Red Ram name is where the trouble starts wearing a nicer shirt. Dodge used Red Ram identity around earlier Dodge engines, and that name can drag old Hemi and older Dodge Poly assumptions into the room if nobody keeps the timeline straight.

The 326 Poly isn’t the earlier Dodge 325 Hemi or 325 Poly wearing a rounding error. It’s not the old Dodge Red Ram Hemi family. It’s an A-series Poly with its own bore, stroke, year, and application. The name may sound familiar, but familiar names don’t bolt the same parts together.

Badge language can make people lazy. A seller says “Red Ram,” and suddenly somebody starts imagining Hemi parts, older Dodge hardware, or rare performance baggage that the engine itself never claimed. Slow down. Red Ram on a 1959 Dodge 326 doesn’t cancel the need to identify the actual block and parts.

The safest rule is ugly but useful: make the metal outrank the name. Casting numbers, stampings, bore, stroke, heads, intake, lifter setup, and car application matter more than the prettiest old Dodge phrase somebody can say while leaning on the fender.

318 Poly and Overbore Confusion

The 326’s closest everyday problem is the 318 Poly. They’re close enough to tempt lazy identification, especially because the 326 used the same 3.3125-inch stroke and a larger bore. That makes “basically a 318” a dangerous shortcut before the first wrench hits the bench.

A 326 isn’t just any 318 Poly that somebody bored until the number got impressive. The factory 326 used its own 3.950-inch bore and its own 1959 Dodge identity. A later overbored 318, replacement engine, or unknown A/Poly core doesn’t become a factory 326 because the math sounds helpful.

That difference matters for value, restoration correctness, piston choice, ring choice, overbore room, and machine work. A real 326 in the right 1959 Dodge is one story. A 318-based build or mystery Poly core with a big-bore claim is another. Don’t let displacement arithmetic do the paperwork’s job.

If somebody claims a 326, measure it or prove it. Bore size, casting information, stamping, application, and vehicle context should agree before the price starts growing. Old A-blocks already give buyers enough ways to get confused. There’s no need to let a caliper stay in the drawer while the seller writes fiction.

Service, Swap, and Identification Confusion

The 326 is uncommon enough that people may either miss it completely or inflate it into something it wasn’t. Both mistakes are expensive. One turns a legitimate 1959 Dodge engine into “probably a 318.” The other turns a narrow-use A/Poly into treasure with spark plugs.

After decades of swaps, rebuilds, stuck engines, parts mixing, and lost paperwork, a 326 may not be sitting where Dodge put it. It may have the wrong carburetor, wrong intake, missing air cleaner, replacement parts, painted-over numbers, or a story that got upgraded every time somebody opened the hood.

That doesn’t make the engine bad. It means the claim has to carry weight. A standard “ran when parked” 326 needs basic identification. A high-dollar original-engine claim needs much more: engine stamping, casting information, vehicle identity, application, dates, hardware, tags, and paperwork all need to stop arguing.

The 326 also needs to stay out of LA 318 confusion. Same Chrysler small-block neighborhood doesn’t mean same engine family. The 326 is an A-series Poly with polyspherical heads and early architecture. Treat it like a later LA small-block and the parts counter will start sharpening its teeth.

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Key Points

The Mopar 326 A/Poly is the Dodge-specific outlier in the A/Poly family. It isn’t a later LA 318, isn’t a Dodge Red Ram 325 Hemi, isn’t the older Dodge 325 Poly, and isn’t a mystery big-block because the number sounds close to older Dodge engine names. It belongs in the A-block Poly family, but it showed up wearing Dodge paperwork. That’s exactly the kind of Mopar detail that turns casual identification into expensive comedy.

The advertised number is 326, but the actual displacement sits close to 325 cubic inches. Dodge used the 326 label to keep it separated from the earlier Dodge 325 family. That means a seller saying “326” may be using the factory name, but the factory name still needs the hardware behind it.

The 326 used the same 3.3125-inch stroke as the 318 Poly, but with a larger 3.950-inch bore. That made it the largest-bore A/Poly in this group, and that bore size keeps it from being treated like a normal 318 rebuild core. Pistons, rings, cylinder-wall condition, and overbore room deserve extra attention before anybody starts promising an easy machine-shop plan.

The 326 is commonly confused with three things: the 318 Poly because the architecture is close, the earlier Dodge 325 Red Ram because the displacement sounds almost identical, and later LA small-blocks because people see “Mopar small block” and quit thinking. All three shortcuts are bad. The 326 is A/Poly architecture, Dodge application, and its own identification problem.

The 1959 Dodge passenger-car application is the main reason this engine belongs on the page. It was a specific answer for a specific Dodge moment after Dodge moved away from its earlier Hemi-based small V8 path. That makes correct application proof more important than ordinary swap-meet confidence.

Don’t let the “largest A/Poly bore” fact turn into fake performance mythology. Bigger bore is real. Hydraulic-lifter passenger-car manners are real. A limited application is real. None of that turns every 326 into a rare race engine or secret factory weapon. If somebody starts stacking special claims on top of the displacement, make the hard parts and paperwork carry the weight.

The hydraulic lifter detail deserves attention because it separates the 326 from many earlier solid-lifter A/Poly engines. That doesn’t make it modern, magical, or automatically easier to build. It means the valvetrain parts and service expectations need to match the actual 326 setup, not somebody’s memory of a 318 Poly or an earlier A-engine.

As a restoration engine, the 326 can be worth saving when the car actually calls for it. A correct 1959 Dodge with its proper 326 is a different animal from a loose, incomplete core with no application trail. The engine can help make the right car right. It doesn’t automatically make a random pile of oily iron valuable just because the displacement is unusual.

Parts support needs suspicion from the first phone call. The 326’s 3.950-inch bore isn’t the same parts conversation as a 318 Poly, and the hydraulic-lifter setup isn’t the same service picture as earlier solid-lifter A engines. Pistons, rings, cam and lifter pieces, rocker parts, gaskets, induction, exhaust, brackets, pulleys, and accessories all need verification before money starts bleeding out of the project.

A used 326 core needs serious inspection before anybody gets misty-eyed about rarity. Check for cracks, freeze damage, thin or rusty cylinder walls, stuck pistons, damaged decks, broken exhaust ears, missing manifolds, missing hydraulic-lifter-specific pieces, missing brackets, butchered mounts, and previous machine work from the “close enough” school of engine rebuilding.

Completeness controls value. A complete, verified 326 with proper manifolds, valvetrain pieces, brackets, accessories, and 1959 Dodge application trail is worth a real look. A bare block, mismatched heads, unknown rotating assembly, and no external hardware is mostly a problem wearing an unusual number. Sellers love unusual numbers. Buyers have to pay for unusual missing pieces.

The 326 should be treated as a proof-first Dodge A/Poly, not a generic horsepower core. Verify the family, verify the bore, verify the lifter setup, verify the original use, and verify what’s missing. If it belongs in the car, save it properly. If the goal is cheap power or easy parts, this is probably the scenic route to a thinner wallet.

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Common Problems

The 326 A/Poly’s trouble starts because it looks close enough to the 318 to make people lazy and uncommon enough to make people guess. It sits in the late-1950s Dodge lane as a bored A/Poly, not an LA 318, not a Plymouth Fury trophy, and not a generic “poly” engine where every part shakes hands. The number is uncommon. The parts still need to prove the story.

• 326 / 318 Confusion
  The 326 lives right next to the 318 in the A/Poly family, and that is where the wrong orders start. Same broad family. Same stroke. Bigger bore. Different displacement. That isn’t enough room for casual parts buying.
  
  Pistons, rings, bore condition, gaskets, compression planning, intake fit, exhaust, distributor details, mounts, and rebuild parts need checking as 326-specific whenever bore or application matters. “It’s basically a 318” isn’t a machine-shop answer. It’s how a parts bill learns to laugh.
• LA Small-Block Assumptions
  The 326 isn’t an LA 318, LA 340, or LA 360. The later LA engines get the catalog attention, but the 326 belongs to the earlier A/Poly world.
  
  That means heads, intake, valve covers, exhaust fit, front dress, mounts, and internal parts can’t be chosen by later small-block habit. A seller saying “small-block Mopar” has not identified the engine. For a 326, that phrase is just a shortcut wearing work boots.
• 1959 Dodge Identity Getting Blurred
  The 326 belongs to a narrow late-1950s Dodge conversation, and that can get smeared into every nearby Mopar story. Dodge, Plymouth, Canadian/export, Fury, and 318 poly talk can all start crashing into the same sentence if nobody keeps the 1959 Dodge context attached.
  
  Application, year, market, casting clues, hardware, carburetion, stampings, and documentation need to stay tied together. A 326 claim shouldn’t borrow Plymouth Fury shine, 318 familiarity, or performance value unless the parts and paperwork back it up.
• Two-Barrel Reality Versus Performance Story
  The 326 has enough displacement to sound more exciting than it usually was. That gives sellers room to turn a solid two-barrel Dodge engine into something with more swagger than proof.
  
  Carburetor, intake, exhaust, air cleaner, camshaft context, application, dates, and documentation all need checking before the story gets dressed up. A good two-barrel 326 can be a strong cruiser engine. It doesn’t become a factory performance package because the displacement is uncommon and the seller speaks louder.
• Uncommon Number, Real Rebuild Bill
  The 326 is uncommon enough to be interesting, but uncommon doesn’t automatically mean valuable or easy. It can make parts hunting harder without making the finished engine more desirable than a better-supported 318 poly.
  
  That’s where the build has to earn its keep. A correct 1959 Dodge restoration or oddball A/Poly build can justify the work. A casual street project may discover that a 318 poly or LA small-block gets the job done with less guessing, less waiting, and fewer expensive surprises.

For broader Mopar A/Poly problems shared across the engine family, use the Mopar A/Poly family page under Common Family Problems.

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Common Misconceptions

The 326 A/Poly gets misunderstood because it sounds like a special secret hiding between the 318 and the rest of the Mopar small-block world. It’s not fake, and it’s not worthless. It’s also not a magic rare engine that turns every loose core into a museum piece. The 326 needs identification, application context, and 326-aware parts checking.

• “The 326 is basically a 318.”
  No. The 326 and 318 are related A/Poly engines, but the 326 has its own bore, displacement, application story, and parts-checking needs.
  
  The 318 may be easier to explain and easier to support. That doesn’t make the 326 a mislabeled 318. Bore-related parts, gaskets, compression planning, and rebuild decisions still need real numbers.
• “The 326 is an LA small-block.”
  No. The 326 is an A/Poly engine, not a later LA wedge-head small-block. The displacement may sound like small-block Mopar territory, but the architecture isn’t the later LA engine people usually picture.
  
  Intake, heads, valve covers, exhaust, front dress, mounts, and internal parts need A/Poly checking. LA habits don’t get to order parts for a 326.
• “Rare 326 means valuable by itself.”
  No. Rare doesn’t automatically mean valuable. Rare can also mean harder to explain, harder to source, and easier to overpay for when the car doesn’t actually need it.
  
  A correct 1959 Dodge or market-specific restoration may care a lot about the 326. A random loose core still has to prove condition, completeness, application, and usefulness before the price starts acting important.
• “Any 326 is a performance engine.”
  No. The 326 can be a good torque engine, but uncommon displacement and 1959 Dodge curiosity don’t automatically equal factory performance hardware.
  
  A performance claim needs parts and proof. Carburetion, intake, exhaust, application, dates, stampings, and documentation all need to agree. Otherwise it’s just a good Dodge engine wearing a louder story.
• “All A/Poly parts interchange with the 326.”
  No. Same broad family doesn’t make every part correct. Year, displacement, bore, market, application, and hardware still matter.
  
  The 326 needs 326-aware checking, especially where pistons, rings, gaskets, compression, induction, exhaust, mounts, and front dress are involved. “It’s all poly” is how the wrong parts arrive with confidence.

For broader Mopar A/Poly misconceptions shared across the family, use the Mopar A/Poly family page under Common Family Misconceptions.

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Upgrade Limitations

The Mopar 326 poly is what happens when the A-series family gets close enough to the 318 poly to fool people, then different enough to make them pay attention. It looks like it should be a simple bigger 318 poly. It isn’t that simple. The 326 is A-poly iron, not an LA 318, not a Magnum, not a Dodge Red Ram Hemi, and not a modern small-block shortcut with extra cubic inches.

The 326 is most closely associated with 1959 Dodge use, generally understood as a larger-bore A-poly using the 3.3125-inch stroke. Many references place the bore around 3.95 inches, often treating it as one of the largest-bore production A-poly variants. That needs physical verification before ordering parts, because “326” is exactly the kind of number that makes sellers, catalogs, and memory start acting brave.

The first upgrade limitation is identity. The 326 isn’t just “a 318 poly, but better.” It has its own year, application, bore size, piston needs, compression expectations, lifter details, and hardware questions. A 1959 Dodge 326, a swapped A-poly core, a bored 318, and a misidentified early poly aren’t the same thing. The build starts with casting numbers, stampings, bore measurement, crank, heads, intake, carburetion, date context, vehicle application, and surviving hardware.

Parts support is better than the smaller oddball A-poly engines in some ways, but the 326 can still be worse than the 318 poly in the one place that matters: exact parts. Pistons, rings, gaskets, camshaft work, valve parts, rocker gear, intake pieces, exhaust manifolds, water parts, brackets, pulleys, linkage, and drivetrain hardware need exact checking. A 318 poly catalog answer may help. It doesn’t get to take the wheel.

The 326’s bigger bore is both the selling point and the warning label. More bore can help breathing and displacement, but it also makes cylinder-wall condition, overbore margin, piston availability, and sonic checking more important. Don’t overbore a 326 casually just because it already sounds bigger than a 318. A large-bore A-poly doesn’t need some hero with a boring bar trying to turn rare iron into a flowerpot.

Compression and camshaft planning need restraint. The 326 has enough displacement to make a useful old Dodge engine, but it still isn’t a later LA performance platform with cheap mistake forgiveness. Too much cam, weak compression, lazy ignition, poor carburetion, stock exhaust, highway gearing, or a heavy car can make it feel dull. A good 326 wants cylinder pressure, clean fuel delivery, correct timing, healthy exhaust, and gearing that fits the vehicle.

Cylinder heads and valvetrain need inspection before celebration. The 326’s poly chamber, rocker gear, pushrods, lifters, valve covers, oiling details, intake fit, and exhaust fit are A-series poly territory. Because the 326 is often discussed with hydraulic lifters, exact verification matters even more. Worn rocker gear, wrong pushrods, tired springs, bad valve seats, and mismatched top-end parts can turn a simple rebuild into a swap meet subscription.

Induction and exhaust need to match the mission. A correct two-barrel setup can make the 326 smooth and useful. A four-barrel or warmed-up build needs compression, cam, exhaust, ignition, and gearing to support it. Random carburetor jewelry, hacked linkage, too much carb, poor fuel distribution, or tight exhaust can make it worse while making it look busier. Busy isn’t the same as better.

Core condition decides whether the project is smart or sentimental. Rust, stuck rings, worn cylinders, cracked exhaust areas, corroded cooling passages, broken bolts, damaged rocker gear, tired valve seats, missing brackets, and unknown machine work can all turn the 326 from interesting into expensive. The bore needs measuring. The walls need checking. The crank and pistons need identifying. The engine’s story needs proof before the money starts nodding.

The honest upgrade plan is mild to moderate and identity-driven. Rebuild the 326 when a correct 1959 Dodge application, complete hardware, A-poly character, or period-correct oddball value matters. Keep the cam sensible, the compression real, the induction simple, the exhaust healthy, and the tune sharp. If the goal is cheap horsepower, easy parts, and modern upgrade choices, a later LA 318, 340, 360, or even a more common 318 poly will usually be smarter. The 326 is interesting because it’s unusual. That doesn’t make it easy.

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When It Actually Makes Sense

The 326 makes sense when it belongs in the car and the identity matters. In a correct 1959 Dodge application where the 326 is part of the vehicle’s story, keeping it can be the right move. It preserves the oddball Dodge/A-poly character instead of turning the car into another later-engine swap with better parts availability and less personality.

It makes sense when the engine is complete. Air cleaner, carburetor, intake, exhaust manifolds, distributor, brackets, pulleys, valve covers, rocker gear, water parts, mounts, transmission pieces, linkage, and application-specific hardware matter. A complete 326 package gives you something worth preserving. An incomplete 326 can become a parts hunt with one-year attitude.

It also makes sense as a mild period-correct driver. A healthy 326 can be smooth, torquey, and interesting when the build stays honest. It needs compression, clean tune, healthy cooling, reasonable exhaust, and gearing that fits the vehicle. It doesn’t need to become a fake race engine to justify itself.

The 326 makes less sense when the goal is performance per dollar. A later LA 318, 340, 360, or more common performance foundation will usually be easier, cheaper, and better supported. Even a 318 poly may be the cleaner A-poly choice when originality doesn’t require the 326. That doesn’t make the 326 junk. It means its value comes from correctness, rarity, and character.

It also makes less sense when the engine is incomplete, undocumented, badly worn, or already mixed with mystery parts. If nobody can prove it’s a real 326, the bore is already tired, the pistons are wrong, the rocker gear is damaged, the brackets are missing, and the drivetrain pieces are gone, the project can get expensive before it gets honorable.

Plain answer: build the 326 when it belongs, when it’s complete, when 1959 Dodge correctness matters, and when the goal is smooth period driving with A-poly personality. Don’t build it because you think it’s just a bigger 318 poly with easy answers. It isn’t. The 326 is close enough to tempt you and rare enough to punish sloppy thinking.

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Compatibility Notes

Family identity.
The 326 is an A-series polyspherical V8 most closely associated with 1959 Dodge use. It belongs in the A/Poly family, not the later LA 318, Magnum small-block, Dodge Red Ram Hemi, Chrysler Hemi, DeSoto Hemi, or older Dodge 325 Poly bucket. Exact year, application, bore, lifter setup, and measurement decide what actually fits.

Bore and stroke proof.
Verify the actual engine before trusting the story. Many references place the 326 near a 3.95-inch bore with the 3.3125-inch A/Poly stroke, but physical measurement is the boss. Check casting numbers, stampings, bore, crank, heads, intake, carburetion, date context, vehicle application, and physical measurements before calling it a 326, 318 Poly, 313, Dodge Poly, bored 318, export engine, Canadian engine, or Hemi-related swap.

326 versus 318 Poly.
The 326 is closely related to the 318 Poly, but it doesn’t become the same engine for parts purposes. Bore size, pistons, rings, compression, lifter details, year, application, and supporting hardware can differ. A 318 Poly recipe can point in a direction. It doesn’t get to finish the 326 build without measurement.

326 versus earlier Dodge 325 engines.
The 326 needs separation from the older Dodge 325 Hemi and Dodge 325 Poly families. The displacement neighborhood is close, and Dodge name history can make that sound comforting, but the block family is different. Red Ram language doesn’t prove the same block, heads, crank, intake, exhaust, valvetrain, or service parts.

326 versus 313 and 303.
The 326 sits in the broader A/Poly family, but it doesn’t become a 313 or 303 because the names show up in the same conversation. Bore, stroke, crank, pistons, heads, intake, year, market, and application details can differ. Family relationship helps prevent total confusion. It doesn’t create free interchange.

326 versus LA small-block.
The 326 is earlier A/Poly iron, not later LA-family hardware. LA intakes, heads, cams, pushrods, pistons, timing parts, exhaust, brackets, accessories, and transmission-related details need to stay out of the order unless exact fit has been proven. The LA engine is the convenient later world. The 326 is earlier A/Poly iron with rare-engine attitude.

326 versus Hemi and other Poly families.
Don’t confuse the 326 A/Poly with early Dodge, DeSoto, or Chrysler Hemi/Poly families. Chrysler Corporation reused names, chamber ideas, and displacement neighborhoods in ways that punish lazy identification. “Poly” describes chamber style. It doesn’t prove the same block, heads, crank, intake, exhaust, valvetrain, or service parts.

Hydraulic lifter and top-end details.
Verify lifter type, camshaft, pushrods, rocker gear, head casting, intake fit, valve covers, timing parts, and oiling details by exact engine. The 326 is often discussed with hydraulic lifters, unlike many earlier A/Poly engines, but that detail still needs inspection. Confirm what is actually in the block before ordering parts.

Intake, exhaust, and accessories.
Verify intake fit, exhaust manifolds, starter clearance, generator or alternator brackets, pulleys, water pump, front dress, mounts, oil pan, steering clearance, and chassis fit. The 326 may look like a familiar A/Poly, but one-year or application-specific hardware can still make a mess. Don’t assume later LA or common 318 Poly pieces will walk in and behave.

Transmission, crank, and starter fit.
Verify crank flange, crank register, bellhousing pattern, adapter plates where used, starter location, flywheel or converter fit, clutch parts, linkage, mounts, driveshaft, and rear gear by exact year and application. Early Mopar drivetrain fit is where “same family” goes broke if nobody measures.

Restoration-correct versus driver-correct versus performance-correct.
For restoration-correct work, the right 326 and its supporting hardware can define a 1959 Dodge. For a driver, a mild rebuild with correct induction, clean ignition, healthy cooling, and honest gearing can make it enjoyable. For performance work, be realistic. The 326 is interesting A/Poly iron, not an LA small-block convenience package with a bigger number and a free lunch.

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Reality Check

The 326 A/Poly is interesting because it’s specific, not because it’s secretly famous. It belongs mainly to the 1959 Dodge story, uses A/Poly architecture, and carries a larger bore than the 318 Poly. That’s enough to make it worth understanding. It doesn’t need fake Hemi smoke, fake race-package talk, or “basically a 318” laziness to matter.

The Red Ram name needs a leash. On this engine, it doesn’t mean the older Dodge 325 Hemi / Poly family, and it doesn’t invite older Dodge Red Ram parts to the party. Casting numbers, bore, stroke, heads, intake, lifter setup, year, and application have to speak louder than the badge language. Names move around. Cast iron is harder to bluff.

The 326 makes the most sense when a correct 1959 Dodge needs it. In that lane, it can be an important restoration engine and a neat short-run Dodge piece. Outside that lane, it becomes an uncommon A/Poly core with special parts questions. That’s not bad. It just means the engine has to justify the trouble before the wallet gets sentimental.

For performance per dollar, the 326 isn’t the smart shortcut. A later LA 318, 340, 360, or even a more common 318 Poly will usually be easier to build, easier to feed parts, and easier to explain. The 326’s value lives in correctness, completeness, and Dodge-specific identity, not cheap horsepower math.

The hard truth is simple: build the 326 when it belongs, when it’s complete, and when the proof is strong. Don’t build it because someone called it rare with a straight face. Rare plus incomplete plus one-year parts logic can become a very expensive way to make ordinary old-car power.

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Bottom Line

The Mopar 326 A/Poly is a one-year Dodge bridge engine, not a broad family workhorse. It used A-series Poly architecture, a larger 3.950-inch bore, and the familiar 3.3125-inch stroke to give Dodge a specific 1959 passenger-car V8 while the division moved away from its older engine family. That makes it interesting, but not automatically legendary.

The 326 makes the most sense in a correct 1959 Dodge where the engine is part of the car’s real identity. In that setting, keeping it can preserve the oddball Dodge / A/Poly transition story. A complete, verified engine with the right manifolds, brackets, valvetrain pieces, accessories, stampings, and vehicle context can be worth saving.

It makes less sense when the goal is easy parts, cheap horsepower, or modern small-block convenience. A later LA 318, 340, or 360 will usually be easier to build and easier to upgrade. Even a more common 318 Poly may be a cleaner A/Poly choice when originality doesn’t require the 326. The 326 is a correct-engine argument, not a shortcut argument.

The mistake to avoid is letting the name do the identifying. The 326 isn’t the earlier Dodge Red Ram 325 Hemi / Poly family, not a normal 318 Poly, not an overbored 318 with factory paperwork, and not an LA small-block. Bore, stroke, castings, stampings, heads, intake, lifter setup, application, and documentation need to settle the matter.

Completeness matters hard here. A complete 326 in the right Dodge can be worth the work. A stuck, stripped, undocumented core missing manifolds, brackets, rocker gear, hydraulic-lifter-specific pieces, front dress, and proof can become expensive before it becomes useful. The unusual number may attract attention, but missing parts still send invoices.

Bottom line: the 326 is worth respecting as a short-run 1959 Dodge A/Poly when the hardware and paperwork agree. Treat it honestly, measure it carefully, and preserve it when the car deserves it. Don’t sell it as a Hemi cousin, don’t build it like an LA, and don’t let “basically a 318” do the work of a tape measure.

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