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Technical Articles for Part Number CCA-GK35-601-8
COMP Cams Thumpr Hydraulic Roller Cam and Lifter Kits GK35-601-8
Part Number: CCA-GK35-601-8
COMP Cams Thumpr Hydraulic Roller Cam and Lifter Kits
Cam/Lifters/Gear, Hydraulic Roller Tappet, Advertised Duration 291/311, Lift .541/.526, Ford, 351W, Kit
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Estimated Ship Date: Dec 11, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
GK35-601-8
Part Type:
Product Line:
Summit Racing Part Number:
CCA-GK35-601-8
UPC:
036584183372
Cam Style:
Hydraulic roller, Retro-fit
Basic Operating RPM Range:
2,200-5,900
Camshaft Use:
Street/Strip
Intake Duration at 050 inch Lift:
235
Exhaust Duration at 050 inch Lift:
249
Duration at 050 inch Lift:
235 int./249 exh.
Advertised Intake Duration:
291
Advertised Exhaust Duration:
311
Advertised Duration:
291 int./311 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
0.541 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:
0.526 in.
Valve Lift with Factory Rocker Arm Ratio:
0.541 int./0.526 exh.
Lobe Separation (degrees):
107
Grind Number:
291THR7
Computer-Controlled Compatible:
No
Lifters Included:
Yes
Lifter Style:
Hydraulic roller
Valve Springs Included:
No
Retainers Included:
No
Locks Included:
No
Valve Stem Seals Included:
No
Timing Chain and Gears Included:
Yes
Timing Chain Style:
Gears
Assembly Lubricant Included:
Yes
Pushrods Included:
No
Rocker Arms Included:
No
Gaskets Included:
No
Valve Springs Required:
Yes
Quantity:
Sold as a kit.
COMP Cams Thumpr Hydraulic Roller Cam and Lifter Kits
COMP Cams is bringing the musclecar sound back, and it's nastier than ever! 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 an ongoing quest to provide you with the performance and sound that you demand, COMP Cams' engineering team proudly introduces the Thumpr Series hydraulic roller cam and lifter kits. They are designed for use in engines that were originally equipped with flat tappet camshafts. The lobe profile and grind characteristics of these Thumpr camshafts use a combination of an early exhaust valve opening, a long exhaust duration, and a generous amount of intake and exhaust overlap. They're designed to maximize the rough-idling characteristics of the cams, giving you a seriously aggressive exhaust note without negatively impacting the power output or streetability of the engine. They are available in three different grind profiles. Each one will produce a rough, racy exhaust note and impressive amounts of horsepower and torque within a different rpm range. Thumpr Series cam and lifter kits feature a cutting-edge hydraulic roller design that delivers a substantial power increase over an identical hydraulic flat tappet grind without sacrificing reliability or ease of maintenance.
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Some parts are not legal for use in California or other states with similar laws / regulations
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