This "Iron" cylinder head is intended for use with the Gen V & Gen VI design 454 (7.4-liter) big-block HO V8 engine (part P/N 24502618) and 502 engine (P/N 24502620). The heads are 118cc open chamber with 2.18" intake valves and 1.88" exhaust valves with rectangular intake ports. They have 3/8" rocker bolt holes. Replaces old part number 12496802
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