Small-Block Chevy Cylinder Head Identification

When GM first introduced its small-block engine to the world, it was specifically designed to give Chevrolet an edge over Ford’s flathead V-8. This was in the mid-’50s, and before that, Chevrolet relied on inline six-cylinder engines to power its passenger vehicles. However, the flathead V-8 was a definite reason Chevrolet had to step-up its game.

Throughout the small block’s timeline, there were three generations of the legendary mill, and the general architecture carried through to the third generation (LS), which was introduced in 1997. The first generation that started it all in 1955, remained in effect until 1992, when the second generation (LT1) was released. The second-generation engine featured aluminum heads, reverse-flow cooling (the heads received coolant first, in lieu of the block), and electronic controls. Then, in 1997, the third-generation small block was released.

In 1962, the 327ci engine in the Corvette was the first small block to offer a 4-inch bore. The cylinder heads on top of that engine were the now-famous double-hump heads. Today, these engine-breathing regulators are usually referred to as “Fuelie” heads, because they were released on Corvettes with Rochester’s fuel injection.

cylinder head ID

Are any of these worth a performance rebuild? If you know what to look for, you could find an uncut diamond waiting to be polished.

Those double-hump heads are still a favorite with nostalgic enthusiasts, even with the availability of today’s better flowing aftermarket offerings.

During the small block’s storied history, there have been a myriad of cylinder head variations, and we are often asked what heads go with what engine, and which ones offer the most performance. Typically, this question is asked after someone locates a set of heads at a swap meet and would like to know if they’re worth anything.

To help you answer that question, we have put together this cylinder head ID listing of  Gen-I and Gen-II small-block Chevy heads. Now, when the question “what heads are these, and will they work for me?” arises while walking around a swap meet, you can at least know what is sitting on the ground or table in front of you. This list, however will not include the gen-III LS offerings.

cylinder head ID

LT1 cylinder head, casting number 10125320. These are a cast-iron version of the reverse-cooling heads used on the 1990’s LT-series engines.

LT-Specific Cylinder Heads

10106178: 1990 LT 350ci V-8. Used on LT5 Corvette ZR1. DOHC 32-valve, aluminum, passenger-side.

10106179: 1990 LT 350ci V-8 350. Used on LT5, Corvette ZR1. DOHC 32-valve, aluminum, driver-side.

10125320: 1994 through 1996 LT 350ci V-8. Used on LT1. cast-iron used on engines with reverse-flow cooling.

10128374: 1992 LT 350ci V-8. Used on LT1. Aluminum with 53cc chambers, angle plugs, reverse-flow cooling, 175cc intake ports, 68cc exhaust ports.

10174389: 1991 through 1995 LT 350ci V-8. Used on LT5 in Corvette ZR1. DOHC 32-valve, driver-side, aluminum.

10174390: 1991 through 1995 LT 350ci V-8. Used on LT5 in Corvette ZR1. DOHC 32-valve, passenger-side, aluminum.

10205245: 1993 LT 350ci V-8. Used on LT1. Aluminum, reverse-flow cooling, 175cc intake ports, 68cc exhaust ports.

10207643: 1994 through 1996 LT 350ci V-8. Used on LT1. Aluminum, reverse-flow cooling, 175cc intake ports, 68cc exhaust ports.

10208890: 1994 through 1996 LT 350ci V-8. Used on LT1 and L99. Cast-iron, reverse-flow cooling.

10225121: 1994 through 1995 LT 350ci V-8. Used on LT5 in Corvette ZR1. DOHC 32-valve, driver-side, aluminum.

10225122: 1995 LT 350ci V-8. Used on LT5 in Corvette ZR1. DOHC 32-valve, passenger-side, aluminum.

10239902: 1996 LT 350ci V-8. Used on LT4. Aluminum, reverse-flow cooling, 195cc intake ports, 54cc chamber, angle plugs.

12529742: 1995 and 1996 LT 265ci V-8. Cast-iron.

12551561: 1996 LT 350ci V-8. Used on LT1. Aluminum, reverse-flow cooling.

12554290: 1994 through 1996 LT 350ci V-8. Used on LT1. Cast-iron, reverse-flow cooling.

12554291: 1995 and 1996 LT 265ci V-8. Used on LT1 and L99, cast-iron.

12555690: 1996 LT 350ci V-8. Used on LT4. aluminum, reverse-flow cooling.

14088526: 1992 through 1997 LT 350ci V-8. Used on LT1. aluminum

One thing to keep in mind, the Gen-1 and LT-specific heads are not easily interchangeable. Each will physically bolt up to the other engine, but the water passages don’t line up. The exhaust ports and exhaust manifold-bolt holes are in the same location. The intake manifold is proprietary to the LT1. However, a standard small-block Chevy intake can be modified to work. All LT1 engines use center-bolt valve covers.

Small-Block Chevy Gen-I Cylinder Heads

Standard Gen-I small-block Chevy heads position the valves at a 23-degree angle to the deck. In 1989, Chevy introduced the 18-degree Bow Tie aluminum head that shifted the valve-angle vertically, while simultaneously raising the intake port to take advantage of this angle. The advantage of the valve angle change is improved airflow due to placing the valve in a more “upright” position relative to the piston. Raising the port also necessitated a dedicated intake manifold.

340292: 1973 through 1980, 64cc chambers, 2.02/1.60-inch valves.

10051101: “Bow Tie,” aluminum, 55cc chambers, 2.02/1.60-inch valves, angle plugs, raised runners, 196cc intake ports.

cylinder head ID

The famous double-hump cylinder heads. Casting numbers 3782461 and 3782461X used 1.94 and 1.50-inch valves. These were commonly called “Fuelie” heads.

10065202: 1987 through 1995 350ci truck engines.

10065203: 1987 through 1995 350ci truck engines.

10065204: 1987 through 1995 350ci passenger car.

10065205: 1987 through 1995 305ci passenger car and truck.

10065206: 1987 through 1995 350ci passenger car and truck.

10065207: 1987 through 1995 305ci passenger car.

10088113: 1988 through 1990 350ci Corvette. Aluminum, 58cc, angle plugs, raised runners, d-port exhaust, 1.94 and 1.50-inch valves.

10110810: 1991 through 1997 305ci and 350ci engines. 65cc chambers. 305ci had 1.84-inch intake valves and 350ci engines had 1.94-inch intake valves.

10120928: 1987 through 1995 350ci engines used in passenger cars.

10134352: Bow Tie Performance head. 45cc chambers, 2.20/1.60-inch valves, angle plugs, low port 18-degree head, 223cc intake ports, aluminum.

10134363: “Bow Tie” aluminum race head. 43cc chamber, 2.02/1.60-inch valves. 18-degree, raised port.

10134354: “Bow Tie” Aluminum, 43cc chamber, 2.02/1.60-inch valves.

10147898: 1995 through 1998 350ci crate engines, 78cc chambers, 1.84/1.50-inch valves.

10159550: 1987 through 1995 350ci (truck), 76cc chambers and 1.94/1.50-inch valves.

10159551: 1987 through 1994 305ci, 58cc chamber and 1.84/1.50-inch valves.

10159552: 1987 through 1995 350ci, 76cc chamber and 1.94/1.50-inch valves.

10159553: 1987 through 1994 305ci, 58cc chamber and 1.84/1.50-inch valves.

10185040: Bow Tie, aluminum race head, 45cc chambers, symmetrical ports, 263cc intake ports, splayed valves.

10185040: Bow Tie, aluminum, 45cc chambers, 2.02/1.60-inch valves, symmetrical ports, 240cc intake ports, splayed valves.

10239906: 1996 350ci, Vortec 5700, L31, 64cc chambers, 170cc intake ports, 1.94/1.50-inch valves.

12367712: 1999 Fast Burn Vortec, aluminum, angle plug, 62cc chambers, 210cc intake ports, 2.00/1.55-inch valves.

12367713: 1999 ZZ430 crate engine, aluminum, 62cc chambers, 210cc intake port, 2.00/1.55-inch valves.

12480011: 1997 Bow Tie SB2.2, aluminum “NASCAR” head. This head was sold as a bare casting when new, so machine work will determine finished valve, chamber, and port sizes.

12506450: 1987 through 1994 350ci, 76cc chamber, 1.94/1.50-inch valves.

12509859: 1987 through 1994 305ci, 58cc chamber, 1.84/1.50-inch valves.

12516852: 1987 through 1994 350ci, 76cc chamber, 1.94/1.50-inch valves.

cylinder head ID

Bow Tie/Vortec cylinder head, casting number 25534421.

12552520: 1997 through 1999 305ci, Vortec, 1.84/1.50-inch valves.

12558059: 1997 305ci, Vortec, truck, 1.84/1.50-inch valves.

12558062: 1998 350ci, L31 Vortec, truck, 64cc chambers, 1.94/1.50-inch valves, 170cc intake ports.

14008856: 1979 through 1981 267ci, 1.71/1.50-inch valves.

14010201: 1982 through 1985 305ci, 58cc chambers, 1.84/1.50-inch valves.

14010516: 1980 through 1986 350ci, 74cc chambers, 1.94/1.50-inch valves.

14011034: Bow Tie, cast-iron, 64cc chambers, 2.02/1.60-inch valves, 184cc intake ports, angle plugs.

14011049: Bow Tie, aluminum, 55cc chambers, 2.02/1.60-inch valves, angle plugs, 180cc intake ports.

14011083: 1955 through 1986 350ci, 64cc chambers, 1.94/1.50-inch valves.

14014415: 1980 through 1985 267ci and 305ci, 64cc, 1.71/1.50-inch valves.

14014416: 1980 through 1986 305ci, 58cc chambers, 1.84/1.50-inch valves.

14014440: 1980 305ci, 58cc chambers, 1.84/1.50-inch valves.

14019821: 1980 through 1986 350ci, 78cc chambers, 1.84/1.50-inch valves.

14019924: 1979 through 1981 267ci, 58cc chambers, 1.71/1.50-inch valves.

14019926: 1980 through 1986 350ci, 78cc chambers, 1.94/1.50-inch valves.

14020517: 1980 350ci, 78cc chamber, 1.84/1.50-inch valves.

cylinder head ID

Vortec cylinder heads have the casting numbers located near the valve springs.

14020555: 1981 305ci, 58cc chambers 1.84/1.50-inch valves.

14020556: 1981 350ci, 78cc chambers, 1.94/1.50-inch valves.

14022056: 1985 350ci, 78cc chambers, 1.94/1.50-inch valves.

14022206: 1980 350ci, 78cc chambers, 1.94/1.50-inch valves.

14022301: 1980 through 1986 305ci, 58cc chambers, 1.84/1.50-inch valves.

14022601: 1980 through 1986 267ci or 305ci, 53cc chambers, could have either 1.72/1.50-inch or 1.84/1.50-inch valves.

14022801: 1980 through 1986 305ci, 58cc chambers, 1.72/1.50-inch valves.

14024816: 350ci, 76cc chambers, 1.94/1.50-inch valves.

14034806: 1978 through 1982 267ci, 58cc chambers, 1.72/1.50-inch valves.

14034807: 1978 through 1986 305ci, 58cc chambers, 1.72/1.50-inch valves.

14034808: 1980 through 1986 350ci, 76 cc chambers, 1.84/1.50-inch valves.

140348086: 1996 350ci, 76cc chambers, 1.94/1.50-inch valves.

14034810: 1980 through 1986 350ci, 76cc chambers, 1.94/1.50-inch valves.

14034811: 1980 through 1986 350ci, 76cc chambers, 1.94/1.50-inch valves.

14039121: 1981 through 1986 305ci, 58cc chambers, 1.72/1.50-inch valves.

14039122: 1981 through 1986 305ci, 58cc chambers, 1.72/1.50-inch valves.

14071114: 1980 through 1986 350ci, 76cc chambers, 1.94/1.50-inch valves.

cylinder head ID

Aluminum Vortec Fast Burn number 19300955

14075381: 1980 through 1986 350ci, 76cc chambers, 1.94/1.60-inch valves.

14079261: 1986 350ci, 76cc chambers, 1.94/1.60-inch valves.

14085844: 1980-through 1986 350ci, 76cc chambers, 1.94/1.60-inch valves.

14085963: 1986 350ci, 76cc chambers, 1.94/1.60-inch valves.

14089119: 1986 through 1988 350ci, 76cc chambers, 1.94/1.60-inch valves.

14094093: 1986 through 1988 350ci, 76cc chambers, 1.94/1.60-inch valves.

14096217: 1955 through 1986 350ci. Originally came on 285 hp or 300 hp crate engines. 64cc chambers, 72- or 90-degree center intake manifold-bolt angles.

14101081: 1987 through 1995 305ci, 58cc chambers, 1.72/1.50-inch valves.

14101083: 1987 350ci. Originally came on crate engines with 285 hp or 300 hp. 64cc chambers, 72-degree center manifold-bolt angles.

14101128: 1986 through 1987 350ci, aluminum, 58cc chambers, 1.94/1.60-inch valves, angle plugs.

14102187: 1987 through 1991 305ci, 58cc chambers, 1.84/1.60-inch valves.

14102191: 1987 350ci, 76cc chambers, 1.94/1.60-inch valves.

14102193: 1987 305ci or 350ci, 65cc chambers, 1.94/1.60-inch valves

1816887: 1963 283ci, 60cc chambers, 1.72/1.50-inch valves.

24502559: 1996 through 1997 Bow Tie, SB2, aluminum, 196cc port, CNC version, 280cc intake ports, 38cc chambers. Originally sold bare, so valve sizes are dependent on machining.

cylinder head ID

All 400ci small-blocks utilize Siamese cylinder walls. This design caused the cooling system to develop hot spots and that is why the 400 heads have steam holes.

25534351C: 2004 Bow Tie, cast-iron, Vortec, 175cc intake ports, 65cc exhaust ports, 2.02/1.55-inch valves.

25534371C: 2004 Bow Tie, cast-iron, Vortec, 206cc intake ports, 77cc exhaust ports, 66cc chambers, 2.02/1.55-inch valves.

330545: 1973 350ci, 76cc chambers, 2.02/1.60-inch valves.

333881: 1974 and 1975 350ci, 76cc chambers, 2.02/1.60-inch valves

333882: 1974 through 1980 350ci or 400ci, 76cc chambers, 1.94/1.60-inch valves.

33417369: 1990 350ci, 76cc chambers, 1.94/1.60-inch valves.

340292: In the ’70s, this was sold over the counter at GM dealers. angle plugs, 64cc chambers, 2.02/1.60-inch valves.

354434: 1975 through 1979 262ci, 267ci, or 305ci, 60cc chambers, 1.72/1.50-inch valves.

358741: 1976 through 1979 305ci, 64cc chambers, 1.72/1.50-inch valves.

3636839: 1955 265ci, 58cc chambers, 1.72/1.50-inch valves.

3703523: 1955 265ci, 58cc chambers, 1.72/1.50-inch valves.

3713358: 1955 and 1956 265ci, 58cc chambers, 1.72/1.50-inch valves.

cylinder head ID

The casting number on this head is 3795896. That verifies it as a 283ci/327ci head with 60cc chambers and 1.72/1.50-inch valves.

3713569: 1955 and 1956 265ci, 58cc chambers and 1.72/1.50-inch valves.

3725306: 1956 265ci, 58cc chambers and 1.72/1.50-inch valves.

3731539: 1957 283ci, 283 hp Corvette, 1.72/1.50-inch valves.

3731544: 1957 through 1963 283ci, 1.72/1.50-inch valves.

3731556: 1957 283ci, 68cc chambers, 1.72/1.50-inch valves.

3731762: 1956 265ci, 68cc chambers, 1.72/1.50-inch valves.

3737775: 1962 through 1967 283ci or 327ci, 68cc chambers, 1.72/1.50-inch valves.

3740997: 1957 283ci, 68cc chambers, 1.72/1.50-inch valves.

3743056: 1958 283ci, 68cc chambers, 1.72/1.50-inch valves.

3743096: 1962 through 1967 327ci, 68cc chambers, 1.72/1.50-inch valves.

3747363: 1957 through 1961 283ci, 68cc chambers, 1.72/1.50-inch valves.

3747460: 1959 through 1967 283ci or 327ci, 70cc chambers.

3748770: 1958 283ci, 68cc chambers, 1.72/1.50-inch valves.

3748772: 1958 through 1961 283ci, 1.72/1.50-inch valves.

3755537: 1957 through 1962 283ci, 1.72/1.50-inch valves.

3755539: 1958 through 1962 283ci, 1.72/1.50-inch valves.

3755549: 1957 through 1962 283ci, 1.72/1.50-inch valves.

3755550: 1959 283ci, 1.72/1.50-inch valves.

3755585: 1962 through 1967 327ci, 1.72/1.50-inch valves.

376445: 1977 through 1985 350ci, 76cc chambers, 1.94/1.60-inch valves.

376450: 1975 through 1981 262ci, 267ci, or 305ci, 60cc chambers, 1.72/1.50-inch valves.

3767460: 1959 through 1960 283ci, 65cc chambers, 1.72/1.50-inch valves.

3767462: 1962 through 1967 327ci, 65cc chambers, 1.94/1.50-inch valves.

3767465: 1959 through 1961 283ci, 65cc chambers, 1.72/1.50-inch valves.

3767754: 1959 through 1961 283ci, 60cc chambers, 1.72/1.50-inch valves.

3767792: 1960 through 1964 283ci, 65cc, chambers, 1.72/1.50-inch valves.

3774682: 1960 through 1964 283ci or 327ci, 70cc chambers, 1.72/1.50-inch valves.

3774684: 1962 through 1964 327ci, 75cc chambers, 1.72/1.50-inch valves.

3774690: 1958 283ci, 1.72/1.50-inch valves.

3774692: 1958 through 1964 283ci, 60cc chambers, 1.72/1.50-inch valves.

3767465: 1960 and 1961 283ci, 1.72/1.50-inch valves.

3782461: 1964 through 1966 327ci, 60cc chambers, 1.94/1.50-inch valves.

cylinder head ID

Casting number 3795896 was nicknamed the “Power Pack” head.

3782461X: 1960 through 1963 28ci3 or 327ci, 60cc chambers, 1.94/1.50-inch valves.

3795896: 1963 through 1965 283ci, 60cc chambers, 1.72/1.50-inch valves.

3795896: 1962 through 1964 327ci, 60cc chambers, 1.72/1.50-inch valves.

3798996: 1963 through 1967 327ci, 65cc chambers, 1.72/1.50-inch valves.

3814480: 1960 through 1967 283ci or 327ci, 70cc chambers, 1.72/1.5-inch valves.

3814482: 1962 through 1967 283ci, 327ci, or 350ci, 75cc chambers, 1.72/1.50-inch valves.

3817680: 1963 through 1967 283ci or 327ci, 64cc chambers, 1.72/1.50-inch valves.

3817681: 1962 through 1967 327ci, 1.72/1.50-inch valves.

3817682: 1961 and 1962 283ci, 1.72/1.50-inch valves.

3836839: 1955 265ci, 58cc chambers, 1.72/1.50-inch valves.

3836842: 1957 through 1967 283ci or 327ci, 1.72/1.50-inch valves.

3837064: 1956 through 1962 265ci or 283ci, 60cc chambers, 1.72/1.50-inch valves.

The Vortec combustion chamber (right) has a radical heart-shaped design. The older Gen I combustion chamber (left) is much more open.

3837065: 1955 and 1956 265ci, 65cc chambers, 1.72/1.50-inch valves.

3848720: 1957 and 1958 283ci, 60cc chambers, 1.72/1.50-inch valves.

3867802: 1957 through 1960 283ci, 1.72/1.50-inch valves.

3876775: 1960 through 1967 283ci and 327ci, 75cc chambers, 1.72/1.50-inch valves.

3884520: 1960 through 1967 283ci, 60cc chambers, 1.72/1.50-inch valves.

3884520: 1962 through 1967 327ci, 60cc chambers, 1.72/1.50-inch valves.

3890462: 1966 and 1967 302ci, 327ci and 350ci, 64cc chambers, 2.02/1.60-inch valves.

3901068: 1987-up 350ci, used on crate engines 64cc chambers, 1.94/1.60-inch valves.

3911032: 1968 307ci and 327ci, 70cc chamber, 1.72/1.50-inch valves.

3912264: 1958 through 1962 283ci, 1.72/1.50-inch valves.

3912265: 1963 and 1964 283ci, 1.72/1.50-inch valves.

3912291: 1968 through 1970 302ci, 327ci, and 350ci, 65cc chambers, 2.02/1.60-inch valves.

3912311: 1965 through 1967 327ci, 1.94/1.50-inch valves.

3912313: 1965 through 1967 327ci, 1.72/1.50-inch valves.

3917290: 1967 and 1968 307ci and 327ci, 1.72/1.50-inch valves.

3917291: 1967 and 1968 302ci, 327ci and 350ci, 64cc chambers, 2.02/1.60-inch valves.

3917292: 1968 327ci and 350ci, 64cc chambers, 2.02/1.60-inch valves.

3917293: 1967 and 1968 307ci and 327ci, 75cc chambers, 1.72/1.50-inch valves.

3927185: 1969 through 1976 307ci, 327ci, or 350ci, 70cc chambers, 1.72/1.50-inch valves.

3927186: 1969 and 1970 302ci and 350ci, 64cc chambers, 2.02/1.60-inch valves.

 

3927187: 1969 and 1970 350ci, 64cc chambers, 2.02/1.60-inch valves.

3927188: 1969 and 1970 307ci, 327ci, and 350ci, 74cc chambers, 1.72/1.50-inch valves.

3928424: 1968 327ci, 64cc chambers.

3928455: 1968 302ci and 327ci, 64cc chambers, 2.02/1.60-inch valves.

3928494: 1968 327ci, 64cc chambers, 2.02/1.50-inch valves.

3929455: 1968 302ci and 327ci, 64cc chambers, 2.20/1.60-inch valves.

3931633: 1968 through 1973 307ci, 1.72/1.50-inch valves.

3931638: 1968 327ci, 64cc, 1.72/1.50-inch valves.

3931635: 1968 through 1976 350ci, 76cc chambers, 1.94/1.50-inch valves.

3932441: 1969 and 1970 350ci, 76cc chambers, 1.94/1.50-inch valves.

3932441X: 1969 and 1970 350ci and 400ci, 80cc chambers, 1.94/1.50-inch valves.

3932454: 1969 through 1973 307ci and 350ci, 76cc chambers, 1.72/1.50-inch valves.

3946812: 1969 350ci, 74cc chambers, 1.72/1.50-inch valves.

3946813: 1969 through 1979 350ci, 76cc chambers, 1.74/1.50-inch valves.

Casting number 12558062 is a Vortec head that is available from Chevrolet Performance. It is completely assembled with 1.94/1.50-inch valves, and 64 cc combustion chambers. It can be machined for 2.20/1.60-inch valves.

3947040: 1968 327ci, 64cc chambers, 1.94/1.50-inch valves.

3947041: 1969 and 1970 302ci or 350ci, 64cc chambers, 1.94/1.50-inch valves.

3947041X: 1969 and 1970 302ci or 350ci, 64cc chambers, 2.02/1.60-inch valves.

3951598: 1970 400ci, 76cc chambers, 1.94/1.50-inch valves.

3964286: 1968 through 1977 350ci, 76cc chambers, 1.94/1.50-inch valves.

3965742: 1970 350ci. This was a Chevrolet replacement head with angle plugs.

3970126: 1967 through 1971 327ci and 350ci, 64cc chambers, 1.72/1.50-inch valves.

3973370: 1969 and 1970 350ci, 64cc chambers, 1.94/1.60-inch valves.

3973414: 1970 350ci, LT1, 64cc chambers, 2.02/1.50-inch valves.

3973487: 1971 and 1972 350ci, 75cc chambers, 1.94/1.50-inch valves.

3973487X: 1971 and 1972 350ci, 75cc chambers, 2.02/1.60-valves.

3973493: 1971 and 1972 400ci, 76cc chambers, 1.94/1.50-inch valves.

3986316: 1971 350ci, 76cc chambers, 2.02/1.60-inch valves.

3986336: 1971 350ci, 76cc chambers, 1.94/1.50-inch valves.

3986336X: 1971 350ci, 76cc chambers, 2.02/1.60-inch valves.

3986339: 1971 307ci and 350ci, 74cc chambers, 1.94/1.50-inch valves.

3986339X: 1971 307ci and 350ci, 74cc chambers, 1.94/1.50-inch valves.

3986388: 1968-1976 307ci and 350ci, 76cc chambers, 1.72/1.50-inch valves.

3991492: 1970 350ci, LT1, 64cc chambers, 2.02/1.60-inch valves.

3998916: 1972 350ci, LT1, 76cc chambers, 2.02/1.60-inch valves.

3998920: 1972 and 1973 350ci, 76cc chambers, 1.94/1.50-inch valves.

3998991: 1972 and 1973 307ci and 350ci, 75cc chambers, 1.72/1.50-inch valves.

3998993: 1972 and 1973 307ci and 350ci, 75cc chambers, 1.72/1.50-inch valves.

3998997: 1972 and 1973 400ci, 76cc chambers, 1.94/1.50-inch valves.

458642: 1975 through 1984 350ci, 76cc chambers, 1.94/1.50-inch valves.

About the author

Randy Bolig

Randy Bolig has been working on cars and has been involved in the hobby ever since he bought his first car when he was only 14 years old. His passion for performance got him noticed by many locals, and he began helping them modify their vehicles.
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