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Big Mutha' Thumpr 243/257 Hydraulic Roller for Pontiac 265-455

Big Mutha' Thumpr™ 243/257 Hydraulic Roller for Pontiac 265-455. Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle. Distributor gear upgrade required.
In stock
More Information
UPC 036584313045
Manufacturer COMP Cams®
Emissions Code
Engine Family Pontiac 265-455 c.i. 8 Cyl. (1955-1981)
RPM Operating Range 2,300-6,100
Cam Type Hydraulic Roller
Camshaft Series Thumpr
Camshaft Gear Attachment 1-Bolt
Usage Street/Strip
California Proposition 65 WARNING: Cancer and Reproductive Harm
Advertised Intake Duration 299
Advertised Exhaust Duration 319
Intake Duration at .050 Inch Lift 243
Exhaust Duration at .050 Inch Lift 257
Intake Valve Lift 0.532
Exhaust Valve Lift 0.519
Lobe Separation 107
Lifter Style Hydraulic Roller