Thumpr 243/257 Hydraulic Flat Cam for Chevrolet Big Block 396-454 Big Mutha' Thumpr: Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle. Grind Number: 295TH7Engine Family: Chevrolet 396-454 c. 050 Inch Lift: 243Exhaust Duration at. 050 Inch Lift: 257Intake Valve Lift: 0.522Exhaust Valve Lift: 0.507Lobe Separation: 107.
GM LS / LT Parts. Comp Cams Big Mutha Thumpr Hyd Camshaft for Chevrolet BBC 396 454. Thumpr 243/257 Hydraulic Flat Cam for Chevrolet Big Block 396-454. Big Mutha' Thumpr: Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle.Rough lopey idle, big block chevy, flat tappet hydraulic. Cancer and Reproductive Harm P65warnings. We accept all major credit cards. Comp Cams K51-433-11 Camshaft K-Kit XR288HR-10 for Pontiac V8. 660 Platinum Dual Valve Spring Kit - LS 4.8 5.3 5.7 6.0 6.2.
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