COMP Cams 51-600-11 Thumpr 227/241 Hydraulic Roller Cam for Pontiac 265-455

Delivering 227-degree intake and 241-degree exhaust duration at.050 inch lift, COMP Cams part 51-600-11 is a hydraulic roller camshaft from the Thumpr series, designed for street and performance applications in 8-cylinder engines. The Thumpr grind produces the distinctive choppy thumping idle valued by enthusiasts. Intake valve lift measures 0.513 inches and exhaust lift 0.498 inches, supporting the aggressive valve event timing required for the series' characteristic behavior. This camshaft does not include lifters or assembly lubricant, and valve springs must be purchased separately.

• Camshaft Series: Thumpr
• Cam Type: Hydraulic Roller
• Grind Number: 283THR7
• Intake Duration at.050 Inch Lift: 227 deg
• Exhaust Duration at.050 Inch Lift: 241 deg
• Advertised Intake Duration: 283 deg
• Advertised Exhaust Duration: 303 deg
• Lobe Separation: 107 deg
• Intake Valve Lift: 0.513 IN
• Exhaust Valve Lift: 0.498 IN
• Lifter Type: Hydraulic Roller
• Lifters Included: No
• Valve Springs Required: Yes
• Assembly Lubricant Included: No
• Camshaft Gear Attachment: 1-Bolt
• Camshaft Material: Billet Steel
• Basic Operating RPM Range: 1,700-5,500 RPM
• Engine Family: Pontiac 265-455 C.I. 8 Cylinder (1955-1981)
• C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?: Yes, but must be a race/competition only vehicle.
• C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?: Yes, but must meet tailpipe emission standards for year of vehicle.
• C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
• C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
• Usage: Street/Performance