Factory MuscleT, 143S 
Factory Replacement

Solid-Factory I.D. # 3863143 for, 396 cu.in., 1967-69 Z28, Factory 375 H.P. 402 cu.in., 1970, Factory 375 H.P. 427 cu.in., 1967-69, Factory 425/435 H.P. 454 cu.in., 1970 LS-6, Factory 450/465 H.P. 454 cu.in., 1971 LS-6, Factory 425 H.P.

Lifter Type: Solid Lifter

Engine Family: Chevrolet 396-454 c.i. 8 Cyl. 1965-1996

Cam Family: factory Muscle COMP Cams® has taken the factory muscle cam specs and reproduced them to our strict tolerances.

Specifications Intake Exhaust RPM Range: Valve Lash: Valve Timing: Duration: Lobe Separation: Duration @ .050" Lift: Intake Centerline: Valve Lift: Lobe Lift: Valve Timing @ 0.006 Lift: Exhaust Closes 32 ATDC Opens 94 BBDC 107 Intake 46 Opens BTDC 80 Closes ABDC

Vehicle Fitments: