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Mutha' Thumpr 235/249 Hydraulic Roller for Pontiac 265-455
Magnum 243/243 Mechanical Roller Small Kit for Pontiac 265-455
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.
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 P65Warnings.ca.gov
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