Big Block Chevy Oval Port Cylinder Head Casting Numbers

Casting Number Engine Size Year Combustion Chambers
336781 454 1973-1985 Open chamber
346236 454 1975-1978 Open chamber (Small or “Peanut” Port Cylinder Heads)
353049 454 1970-1973 Open chamber
3872702 396 and 427 1966 Closed chamber
3904390 427 1966 Closed chamber
3904390 427 1966 Closed chamber
3909802 396 and 427 1966-1967 Closed chamber
3917215 396 and 427 1966-1969 Closed chamber
3931063 396 and 427 1966-1969 Closed chamber
3964280 427 and 454 1966-1970 Closed chamber
3964290 427 and 454 1966-1970 Closed chamber
3993820 402 and 454 1970-1971 Open chamber
3999241 402 1970-1972 Open chamber
6272292 402 and 454 1971 Open chamber

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