COMP Cams Big Mutha' Thumpr Hydraulic Roller Camshaft - Small Block Chevy 12-602-8 63-53547172B and the dividers are pulled

and the dividers are pulled back to increase plenum size and shorten the runners for improved high rpm performance

increased spark plug life & cold weather starting

120 in Journal

Kits come with hardened parallel-ground washers

COMP Cams Big Mutha' Thumpr Hydraulic Roller Camshaft - Small Block Chevy 12-602-8 63-53547172B and the dividers are pulledComp Cams Big Mutha' Thumpr Hydraulic Roller Camshaft Small Block Chevy Street strip, needs 9. 5: 1 compression, 2800+ stall, intake, gears and headers, very rough idle. COMP Cams Big Mutha' Thumpr 299THR 7 Hydraulic Roller Camshaft for Small Block Chevy Product Description: Camshaft Big Mutha' Thumpr Hydraulic Roller Lift 0. 533 0. 519 in Duration 299 319 107 LSA 2500 6200 RPM Small Block Chevy For 30 years, the COMP Cams philosophy has never