Chevrolet Performance 19210721 - Hydraulic Roller Camshaft Big Block Chevy

This steel roller camshaft is for GM 572-620 HP Crate Engines. (Must use distributor gear 809-10456413.) The duration at .050" tappet lift (intake/exhaust) is 254/264; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is .632/.632. Valve lash is zero/zero and lobe centerline is 112 degrees. Lifters Not Included. Cam has mechanical fuel pump lobe.