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Hagerty
Hagerty Employee

V-8 pairs that share displacements but not manufacturers | Hagerty Media

If you're an AMC owner and get tired of questions like "Why did they install a Chevy engine in an AMC?", this story is for you. Ditto Studebaker folks who must deal with people asking about the Ford 289 in their Lark.
https://www.hagerty.com/media/lists/v-8-pairs-that-share-displacements-but-not-manufacturers/
125 REPLIES 125
BobAustin100
New Driver

Great article! Here are three more V8 pairs with the same displacement but significant differences:

1) A tale of two 318s. Mother Mopar's 318 V8 was among the longest-running V8s in history--from 1957 all the way into the late 1990s, when it was replaced by the 4.7 OHC PowerTech. But people often confuse the early A-series 318 (1957-66 in the US and 67 in Canada) with the later LA, or "Light A," version. The early A-series 318 polysphere features semi-hemispherical combustion chambers inspired by the Hemi, including its canted intake valve, but with the valve diagonally opposed and situated vertically, allowing a single rocker shaft yet retaining the Hemi's straight and direct ports. A forged crankshaft, solid lifters, and other robust qualities helped provide the bulletproof reputation the 318 is known for. The later, LA 318 is essentially the same below the heads, but its wedge-shaped combustion chambers and thin-wall casting make it both narrower and some 60 pounds lighter--perfect as a mightier replacement for the 273 V8 in compact Darts, Valiants, and Barracudas. Confusion--and potential damage--can occur if you use the longer LA spark plugs in the earlier polysphere 318 (or, eventually, if you accidentally use the shorter A-series plugs in the later wedge-head version). While power output was the same 230 hp/340 lbs ft torque for both 318s in two-barrel form, the original poly-head 318 was also available with 260 hp in four-barrel form--and a whopping 290 with dual four-barrels for 1957 and 58. And dig those scalloped valve covers. That semi-semi, polyspherical combustion chamber must have worked: Mopar used essentially the same design with the same diagonally opposed valves and semi-spherical surface in the 4.7 V8.

2) Mopar's 325 Hemi and polysphere V8. Dodge's first-generation V8s (1953 through 1958) could be had with Hemi heads OR the semi-semi, polyspherical variety. Manifolds, heads, pistons, and pushrods were the only real difference, along with a 25-horsepower bump for the Hemi 325 for 1957. But with 265 hp in four-barrel guise for '58, the 325 "poly" was no slouch.

3) Pontiac 326 and Dodge 326. In this case, we're dealing with two totally different engines from two totally different companies. The Pontiac 326 was essentially an underbored, undersquare version of the big-block 389 V8 of GTO fame (with a few other differences of course!). It's a good, solid engine with approaching 300 hp in four-barrel form and most readily found in Pontiac's mid-sixties Lemans and Firebird. Mopar's 326 was a one-year-only engine offered only for 1959 and only in that year's Dodge. But aside from a slightly larger bore and hydraulic lifters, it shares all of its internals--including its semi-hemi polyspherical combustion chambers--with Mopar's first-generation, A-series 318. A twin-pot carburetor was the only option; yet it still cranked out a healthy 255 horses vs. 230 for the two-barrel 318. And if you aren't confused enough by now, the V8 it replaced was none other than Dodge's 325 semi/poly V8, which was also used in entry-level Firesweep Desotos in the late 1950s. Naturally, people also confuse the 325 and 326--and, naturally, the two V8s share nothing in common!

3) Chevrolet 350 and Mopar 350. The Chevy 350 is easily the most popular V8 in history, at least judging by the uncountable number of them in everything from Novas to trucks to street rods. But Mother Mopar also offered a 350 with 305 hp in 1958 Plymouth Furys as a step-up from the 290-hp 318 as well versions with slightly under 300 hp in Dodges and Desotos that year. And unlike the small-block Chevy, Mopar's 350 was the very first of its big-block V8s that would grow to 400 cu in in low-deck form and 440 cubes in raised-deck versions.
Trademark
New Driver

the 318 wide block and the 318 la both Mopar and completely different
okfoz
Intermediate Driver

Probably the most obvious to me is the 455 Buick, 455 Olds and 455 Pontiac, each were unique engines.
Buick 4.31 x 3.90 (1970-1976) (370HP - 205HP)
Olds 4.13 x 4.25 (1968-1976) (400HP - 215HP)
Pontiac 4.15 x 4.21 (1970-1976) (370HP - 200HP)
Steely
New Driver

How about AMC 304 and Studebaker 304? AMC 360 and Chrysler 360? Ford 428 and Pontiac 428? Or, Studebaker's 232 V8 and AMC's 232 Inline 6? AMC's 390 and Ford's 390..seems like you left out many other interesting choices.
Airrecon
Pit Crew

Had a 390, 68 AMX. Won a number of (beer) bets with people insisting it was a Ford engine
SlowJoeCrow
Intermediate Driver

GM has a lot of intramural duplication. Chevrolet and Oldsmobile both had a 307 and 350 V8s. If you go metric Chevy actually had 3 different 5.0 liter small block variations, the 302/307 twins made by mixing and matching 283 and 327 parts. and the 305 made by reducing the bore on a 350.
(302 is the Z28 engine, 283 crank in a 327 block, 307 was the base engine for the period with a 327 crank in a 283 block).
Ford also duplicated displacement in different engine families since the 330 ci FE truck engine and the 5.4 Triton have the same displacement.
GilbertVehServ
New Driver

There are a few within the GM family:

307cid V8 by Chevrolet and Oldsmobile

350cid V8 by Buick, Chevrolet, Oldsmobile and Pontiac

And a few others that come to mind:

302cid V8 from both Chevrolet and Ford

427cid V8 from both Chevrolet and Ford

428cid V8 from both Pontiac and Ford

don
New Driver

Ford 260 and Olds 260 gas or diesel
241Hemi
Pit Crew

Don't forget AMC had a 232 six (inline)and buick had a 232 six (V6) as well as the little Stude 232 V8 and mopar.
Chevy had a 265 V8 (before the 283) and Chrysler/Mopar had a 265 inline 6. - and Pontiac also had a 265 V8 (4.3 liter) - and Chevy had the 263 (4.3 liter) V6.
Ford made at least 2 302 engines - and Chevy made the 302 Z28

Chrysler has 2 413s too - the Elephant V8 and the truck flathead 6.
AMC Jeep has the 4 liter inline six, Ford the 4 liter V6, and Mopar the 241 baby Hemi (241) - all within a hair of identical displacement - and then toss in the Jag 4 liter too.

3.8 Liter - Jag inline six, Buick and Chevy had 2 different V6 engines plus Chrysler/Mopar/Jeep and Ford essex V6
Buick and Mopar both had different 225 cu inch sixes - one inline and 1 V.
AMC and Mopar both built 360 V8 engines.
Ford and Chrysler both built 361 V8s)
AMC and International Harvester both had 304 V8s.
Chrysler , Oldsmobile, Buick, Chevrolet and Oldsmobile all built 350 cu inch v8s.
Ford built several 3 liter engines - plus Jag and just about every Japanese manufacturer.
Buick and Mopar both had 340 V8s
Ford and Chevy both made a 292.
AMC and international both built 196 engines (one a six and 1 a 4)

I'm sure I've missed a few others. (particularly the newer metric engines, where EVERONE built a 1.6 or a 2.2 etc.
johnlwatson
New Driver

How about Ford 427 and Hyundai equus 427 -425 horse

BenjieMcCall
New Driver

And don't forget Ford's pair of 351's... Windsor & Cleveland.
edbass0922
New Driver

WHAT HAPPENED TO FORDS 312 CI AND STUDEBAKER 312 CI ? I HAD A 53 COUPE WITH 259 CI HOWEVER THE FRONT JOURNALS DID NOT HAVE MUCH ROOM FOR OIL THE PAN WAS VERY SHORT GOING UP OVER THE FRONT CROSSMEMBER WITH OVERDRIVE I COULD CRUISE ABOUT 90 MPH BUT THE OIL WAS NOT GETTING TO THE CRANK GOOD ENOUGH AND I LOST THE BEARINGS FIXED THE ENGINE NOT KNOWING WHAT REALLY CAUSED THE PROBLEM AND LOST THEM AGAIN IN A VERY SHORT TIME, I WAS ONLY 19 AT THE TIME AND BECAUSE MY DAD OWNED A LARGE REPAIR SHOP IN OAK CLIFF (DALLAS) I HAD HELP IN CHANGEING THE SUPPORTS TO RAISE THE ENGINE ENOUGH TO USE A MODIFIED OIL PAN. I WANTED MORE POWER SO I USED A MY 259 BLOCK HAD IT SLEEVED AND USED 312 PISTONS? SOUND LIKE A CHEVY, SHORT STROKE AND LARGE BORE PISTONS IN IT OR WAS TOLD THAT'S WHAT THEY WERE BY A RACE CAR MECHANIC AND DRIVER THAT ONLY RACED STUDEBAKER CARS FROM 56 TO ABOUT 1968 GOT KILLED AT THE DEVIL'S DOWL IN DALLAS TEXAS (68 OR 69). THIS MECHANIC LIKED ME AND HELPED ME TO DO HEAD WORK AND INTAKE WORK USING A HOLLEY 4 BARREL , NORFLETE (DALLAS) MADE THE CAMSHAFT , NOT SURE WHO MADE THE LIFTERS AND SPRINGS, BUT HE HAD HEADERS FROM ONE OF THE THE RACE CARS AND GAVE THEM TO ME. HE MODIFIED A CORVETTE FLYWHEEL LIGHT WEIGHT AND HEAVY DUTY CLUTCH ASSY, I FOUND A WRECKED AND ABANDONED 63 LARK WITH A FOUR SPEED AND INSTALLED THE FOUR SPEED AND 4:11 GEARS IN THE REAR MYSELF. I ALSO MADE MY ON DRAG LINK BARS AND FINALLY GOT MICKY THOMPSON STREET SLICKS (USED) I DID NOT HAVE MUCH MONEY BUT WHAT I MADE WORKING AT MY DAD'S SHOP I SPENT ON MY CAR., ANYWAY I STILL HAVE TWO LARGE BOXES OF TROPHY'S (SPENT THE CASH 5 OR 10 DOLLARS A WEEK THAT I WON ON SIDE BETS) DURING THE LATE 60'S AND EARLY 70'S. I'M 82 NOW AND STILL BUILDING CARS I'M CURRENTLY BUILDING A 1969 EL CAMINO COMPLETE BODY OFF RESTORATION SHOULD BE FINISHED SOMETIME EARLY JUNE THEN I WILL FINISH MY 1955 2 DR BEL AIR IT GETS A ,LS-2 AND ROADSTER WORLD CHASSIS
ED BASS , DALLAS TEXAS
Jc10651
New Driver

Mercury 361 from the 50’s I believe it was in some of the police cars also and Chrysler’s 361.
MikeAMG
New Driver

What about 336 cu in engines. There were 2 different GM engines with that displacement in the 1950s, not to mention the Mercedes AMG V8 variants from the 2000s into the 2010s
spoonified
New Driver

One fun one you missed if you ignored the v-8 only is the 305 SBC and the 305 GMC V6, or the 351 Windsor Ford, 351 Cleveland Ford and again the 351 GMC V-6. On V-8's the 427 Ford FE, Ford "cammer" and Chevy, or the 426 Ford and 426 Mopar
hyperv6
Technician

Displacement between mfgs means little. 

Now displacement between divisions meant the world. 

GM shared some sizes like the 400 but 400 was much different in a Pontiac vs Chevy. 

When GM went to just using cooperate engines most of their cars lost their soul. The pounding roaring hearts under the hoods is what gave each car a different personality and feel. 

Let’s face it the Olds corporate  engine was never a desired engine in the Trans Am. Later on the 350 Corporate rendered the Late Trans Am just a styling exercise. 

Many late Pontiac fans never understood this as they never experienced a real Pontiac engine other than an Iron Duke.

CJ281
New Driver

My uncle worked at the Richardson street Nash assembly plant which later became Rambler and later still American Motors. His hot rod was a 1962 Rambler with a 327, 3 on the tree, posi rear, and overdrive. He told me that he beat several Chevys with his car. Wish I could have saved that one.
Pontiac1
New Driver

For me the most obvious is the Ford 427 vs. Chev. 427.
Two great motors.
KKaucher
Pit Crew

My car buddies and I used to do this as a drinking game, here are a few more I remember. Ford's and Chevy's 427, Ford's, Lincoln Y block series and Chevy's 302, Pontiac, Buick and Olds 455.and the GM, 350 variants from Cadillac, Chevy, Buick Pontiac and Olds, The B series Chrysler 350 big block. The Pontiac and Ford's 428, AMC,Cadillac and Ford's 390, Cadillac and Ford's 429, Buick, Chevy, Chrysler,Ford Pontiac,and Olds 400,
Buick, Cadillac and Olds 425, Buick and Chryslers 340. AMC, Ford (truck FE) and Chryslers 360, Ford and Olds 260, AMC and Buicks 401, Pontiac and Olds 303, and Cadillac and Chrysler's 331
Patrician
Intermediate Driver

Looks like everyone missed the 1958-1959 Mercury 383 and Chrysler 383.
OHCOddball
Intermediate Driver

Don't forget the following:
360: Ford FE, AMC, Mopar
401: Buick, AMC
350 and 455: Buick, Olds, Pontiac (techinically same manufacturer--GM--but totally different engines
These are just the ones off the top of my head--there are more
Airrecon
Pit Crew

My "68 AMX 390. Light weight, good handling and fast as hell. Almost everyone insisted it was a ford 390. would have to take them out and let them look under the hood and compare it with a Ford 390 with obvious differences. Won a few (beer) bets on this
bartl
New Driver

Ford & Mercury 410's. Ford & Pontiac 428's. AMC & IH 304. IH & Chrysler 392. Cadillac, AMC & Ford 390. Cadillac & Ford 429. AMC & Chevy 283. Buick & Chrysler 225. Ford & Olds 260. Ford & GM 292. Ford, GM & Chrysler 400. Ford & Chevy 427. IH & Chrysler (modern hemi) 345. Ford (truck) & Olds 330. Ford (Edsel & truck) & Chrysler 361. Cadillac & Chrysler 331. Lincoln & Chrysler 383.... and more.
d2willys
New Driver

Another old timer from Ford. 332 Y block in big trucks of early 1950s. 332 FE in 1958 and 1959 Ford cars.
DanSmith
New Driver

350,Plymouth long before the various GM 350s
BillKaslow
New Driver

390 Ford & AMC
400 GM, Ford & Chrysler