COMP Cams CL51-413-11 Xtreme Energy 212/218 Retro-Fit Hydraulic Roller Cam and Lifter Kit for Pontiac 265-455

The COMP Cams CL51-413-11 Xtreme Energy Hydraulic Roller Cam and Lifter Kit is a retro-fit hydraulic roller camshaft package engineered specifically for Pontiac 265-455 cubic inch V8 engines (1955–1981). Designed for daily drivers and street performance builds, this cam delivers strong torque, a smooth idle, and broad power across a wide RPM range — all with no sacrifice in street manners.

COMP Cams' Xtreme Energy lobe profiles are built around an aggressive grind that opens the valve faster than conventional cam designs, putting more area under the lift curve for improved throttle response and increased top-end horsepower. At the same time, the profile maintains higher engine vacuum compared to flat-tappet cams of similar duration, helping retain power brake assist and clean idle quality.

Camshaft Specifications:

• Grind: XR264HR-10
• Camshaft Type: Retro-Fit Hydraulic Roller
• Advertised Duration: 264° Intake / 270° Exhaust
• Duration at .050" Lift: 212° Intake / 218° Exhaust
• Valve Lift (1.5:1 Rockers): .487" Intake / .495" Exhaust
• Valve Lift (1.65:1 Rockers): .535" Intake / .544" Exhaust
• Lobe Separation Angle: 110°
• Operating RPM Range: 1,000–5,000 RPM
• Camshaft Material: Billet Steel
• Cam Gear Attachment: 1-Bolt

Kit Includes:

• XR264HR-10 Hydraulic Roller Camshaft
• COMP Cams 85701 Upgraded Hydraulic Roller Lifters
• Assembly lube
• Decals and installation instructions

Upgrade Options: This kit can be upgraded to a K-Kit (K51-413-11) or SK-Kit (SK51-413-11) for a more complete valvetrain package. New valve springs are recommended due to the aggressive lobe profile — stock springs are not sufficient for this application.

Made in the USA, the CL51-413-11 is the ideal cam-and-lifter solution for Pontiac enthusiasts seeking a significant performance gain over the stock camshaft while preserving excellent street driveability.