Manufacturer's Part Number:
COMP Cams Thumpr Hydraulic Flat Tappet Cam and Lifter Kits
Summit Racing Part Number:
Hydraulic flat tappet
Basic Operating RPM Range:
Intake Duration at 050 inch Lift:
Exhaust Duration at 050 inch Lift:
Duration at 050 inch Lift:
227 int./241 exh.
Advertised Intake Duration:
Advertised Exhaust Duration:
279 int./297 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
Exhaust Valve Lift with Factory Rocker Arm Ratio:
Valve Lift with Factory Rocker Arm Ratio:
0.479 int./0.465 exh.
Lobe Separation (degrees):
Camshaft Gear Attachment:
Hydraulic flat tappet
Valve Springs Included:
Outside Diameter of Outer Spring (in):
Valve Stem Seals Included:
Timing Chain and Gears Included:
Timing Chain Style:
Assembly Lubricant Included:
Rocker Arms Included:
Valve Springs Required:
Sold as a kit.
Choose In-store pick-up (OH, GA, NV) on our web site.
COMP Cams is bringing the musclecar sound back, and it's nastier than ever! Let's face it--few things serve to grab our attention at a car show or cruise night more than a car with a thumping, high performance idle. In fact, one of the most frequent questions fielded when customers call our tech line is, "What camshaft will give my car that mean-sounding idle?" In an ongoing quest to provide you with the performance and sound you demand, COMP Cams engineering team proudly introduces the Thumpr series cam and lifter kits. The lobe profile and grind characteristics of these new Thumpr camshafts use a combination of an early exhaust valve opening, a long exhaust duration, and a generous amount of intake and exhaust overlap to maximize the rough-idling characteristics of the cams. This gives you a seriously aggressive exhaust note without negatively impacting the power output or streetability of the engine. Thumpr camshafts are available in different grind profiles; each one will produce a rough, racy exhaust note and impressive amounts of horsepower and torque within a different rpm range. These Thumpr series cam and lifter kits deliver a substantial power increase over an identical hydraulic flat tappet grind without sacrificing reliability or ease of maintenance.