Manufacturer's Part Number:
Summit Racing Part Number:
Hydraulic roller tappet
Basic Operating RPM Range:
Intake Duration at 050 inch Lift:
Exhaust Duration at 050 inch Lift:
Duration at 050 inch Lift:
243 int./257 exh.
Advertised Intake Duration:
Advertised Exhaust Duration:
299 int./319 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
Exhaust Valve Lift with Factory Rocker Arm Ratio:
Valve Lift with Factory Rocker Arm Ratio:
0.552 int./0.537 exh.
Lobe Separation (degrees):
Valve Springs Included:
Outside Diameter of Outer Spring (in):
Valve Stem Seals Included:
Timing Chain and Gears Included:
Timing Chain Style:
Assembly Lubricant Included:
Valve Springs Required:
5 - Requires distributor gear upgrade.
Choose In-store pick-up (OH, GA, NV) on our web site.
Musclecar sound is back and nastier than ever with these Thumpr retrofit hydraulic roller cam and lifter kits from COMP Cams! These cams feature a thumping high performance idle and provide significant horsepower and torque increases. Specially engineered profiles are offered for each unique engine, providing the perfect combination of an early intake valve opening, a long exhaust duration, and a generous amount of intake and exhaust overlap to maximize your engine's nasty-idling characteristics without negatively impacting streetability. These kits include high-quality matched lifters for unbeatable performance, durability, and ease of installation.