Factory I.D. 3863143 for: 396c.i., 1967-69 Z28, factory 375 HP; 402c.i., 1970, factory 375 HP; 427c.i., 1967-69, factory 425/435 HP; 454c.i., 1970 LS6, factory 450/465 HP; 454c.i., 1971 LS6, factory 425 HP
Chevrolet GEN IV 396-454 Big Block Engines Originally Equipped with Flat Tappet Camshafts
