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1953 - 1967 Corvette Specification Guide
(1953-1967 Cylinder Head Casting Numbers)

1953

3836066*

6-Cylinder, 150 Horsepower

 

1954

3836241*

6-Cylinder, 150/155  Horsepower

 

1955

3836241* 6-Cylinder, 155  Horsepower
3703523 V-8, 195 Horsepower

* The tapped hole for the 1953-55-6-cylinder temperature sender did not require an adaptor.


1956

3725306 All 210 & Early-255 Horsepower with 2-bolt Exhaust Manifolds
3731762** Later- 225 & All 240 Horsepower with 3-bolt Exhaust Manifolds

** Some carryover into early 1957 production occurred.

 

1957

3740997 220, 245, 250 & 270 Horsepower
3731539 283 Horsepower, Fuel Injection

 

1958-1960

3748770***

1958 & possibly very-early-1959; All Engines; Contains "X58" on Side

3755550***

Early-1959; All Engines

3767465

Late-1959; All Engines

3774692

All 1960 Engines

*** Staggered valve cover mounting holes.

 

1961

3774692

230, 245 & 270 Horsepower

3782461

275 & 315  Horsepower, Fuel Injection

 

1962

3795896 250 Horsepower
3884520 250 Horsepower (unverified)
3782461 300, 340 & 360 Horsepower

 

1963-1964

3795896

Base 250 Horsepower

3782461

All Optional Engines

 

1965

3782461

All 327 Cubic-Inch Engines

3856208

425 Horsepower 396 Cubic-Inch Engines

 

1966

3782461 All 327 Cubic-Inch Engines
3872702 390 Horsepower 427 Engines
3873858 427 Horsepower 427 Engines

 

1967

3890462

300 & 350 Horsepower 327 Engines

3909802

390 & 400 Horsepower 427 Engines

3904391

435 Horsepower 427 Engines (Cast Iron)

3904392

L88 & L89 (Aluminum)

       

Corvette Cylinder Head Casting Information

The six cylinder engine cylinder head casting number is located on the left top of the head, between the valves of the #2 and #3 cylinders, directly above their exhaust port outlet.  The number is visible with the valve rocker cover installed.

 

The six cylinder head casting date is located in the valve rocker area next to the #4 and #5 cylinder exhaust valves, and is visible only with the valve rocker cover removed.  The casting date is deciphered in the same manner as described for engine blocks.

 

The V-8 cylinder head casting numbers and casting dates are located in the valve rocker area and are only visible with the valve cover removed.  Casting dates for cast-iron cylinder heads are deciphered in the same manner as described for engine blocks.  Aluminum cylinder heads may not necessarily carry a normal casting date, but rather a mold date.  Aluminum cylinder heads usually carry a "W" within a snowflake, symbolic of the Winters Aluminum Foundry Company.

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