1963-1967 Corvette Head Casting Numbers

1963-1964

Number Engine
3795896 Base 250 Horsepower
3782461 All Optional Engines

1965

Number Engine
3782461 All 327 Cubic-Inch Engines
3856208 425 Horsepower 396 Cubic-Inch Engines

1966

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

1967

Number Engine
3890462 300 & 350 Horsepower 327 Engines
3909802 390 & 400 Horsepower 427 Engines
3904391 435 Horsepower 427 Engines (Cast Iron)
3904392 L88 & L89 (Aluminum)