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1968 - 1982 Corvette Specification Guide
(1968-1982 Cylinder Head Casting Numbers)

1968 Cylinder Head Casting Numbers

3917291

300, 350 Horsepower 327 Cubic-Inch Engines

3917292

 350 Horsepower 327 Cubic-Inch Engine

3917215

390 & 400 Horsepower 427 Cubic-Inch Engines

3919840

435 Horsepower 427 Cubic-Inch Engine (Cast Iron)

3919842 L88 & L89 (Aluminum)

 

1969 Cylinder Head Casting Numbers

3927186

300 & 350 Horsepower 350 Cubic-Inch Engines

3927187

 350 Horsepower 350 Cubic-Inch Engine

3947041

300 Horsepower 350 Cubic-Inch Engine

3931063

390 & 400 Horsepower 427 Cubic-Inch Engines

3919840

435 Horsepower 427 Cubic-Inch Engine (Cast Iron)

3919842 L89 (Aluminum)
3946074 L88 & ZL1 (Aluminum)

 

1970 Cylinder Head Casting Numbers

3927186

300, 350 & 370 Horsepower 350 Cubic-Inch Engines

3927187

 350 Horsepower 350 Cubic-Inch Engine

3973414

370 Horsepower 350 Cubic-Inch Engine

3964290

390 Horsepower 454 Cubic-Inch Engine

3964291*

460 Horsepower LS7 Engine

 

*The LS7 engine was not produced for retail sale.

1971 Cylinder Head Casting Numbers

3973487

270 & 330 Horsepower 350 Cubic-Inch Engines

3993820

 365 Horsepower 454 Cubic-Inch Engine

3994026

425 Horsepower 454 Cubic-Inch LS6 Engine (unverified)

3946074

425 Horsepower 454 Cubic-Inch LS6 Engine

 


1972
Cylinder Head Casting Numbers

3973487(X)

200 & 255 Horsepower 350 Cubic-Inch Engines

3998993

 200 Horsepower 350 Cubic-Inch Engine (unverified)

3998916

255 Horsepower 350 Cubic-Inch Engine (unverified)

3999241

270 Horsepower 454 Cubic-Inch Engine

*Note:  (X) indicates an "X" casting foundry proof mark will appear after the seven-digit casting number on later 1972 base engine and LT1 3973487 cylinder heads. 

 

1973 Cylinder Head Casting Numbers

3998993, 333881, 333882

L48 350 Cubic-Inch Base Engine

330545

L82 350 Cubic-Inch Optional Engine

353049

LS4 454 Cubic-Inch Optional Engine

 

1974 Cylinder Head Casting Numbers

333881, 333882

L48 350 Cubic-Inch Base Engine

333882

L82 350 Cubic-Inch Optional Engine

336781

LS4 454 Cubic-Inch Optional Engine

 

1975 & 1976 Cylinder Head Casting Numbers

333882

All 350 Cubic-Inch Engines

 

1977 Cylinder Head Casting Numbers

 333882, 376450

L48 350 Cubic-Inch Base Engine

333882

L82 350 Cubic-Inch Optional Engine

 

1978 & 1982 Cylinder Head Casting Numbers

462624

All 350 Cubic-Inch Engines

14014416

1980 305 Cubic-Inch Optional Engines (California)

 

Corvette Cylinder Head Casting Information

 

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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