COMP Cams Thumpr Hydraulic Flat Tappet Cam and Lifter Kits K21-601-5

COMP Cams is bringing the muscle car 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 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 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. 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.Brand: COMP Cams
Manufacturer's Part Number: K21-601-5
Part Type: Camshaft Kits
Product Line: COMP Cams Thumpr Hydraulic Flat Tappet Cam and Lifter Kits
HP Direct Part Number: CCA-K21-601-5
UPC: 036584214571
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,200-6,100
Camshaft Use: Street/Strip
Camshaft Manufacturers Description: High performance street/strip, needs 9:1 compression, 2,500+ stall, intake, gears and headers, rough idle.
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: 287
Advertised Exhaust Duration: 304
Advertised Duration: 287 int./304 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.497 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.483 in.
Valve Lift with Factory Rocker Arm Ratio: 0.497 int./0.483 exh.
Lobe Separation (degrees): 107
Camshaft Gear Attachment: 1-bolt
Grind Number: 287TH7
Computer-Controlled Compatible: No
Lifters Included: Yes
Lifter Style: Hydraulic flat tappet
Valve Springs Included: Yes
Outside Diameter of Outer Spring (in.): 1.524 in.
Retainers Included: Yes
Locks Included: Yes
Valve Stem Seals Included: Yes
Timing Chain and Gears Included: Yes
Timing Chain Style: Double roller
Assembly Lubricant Included: Yes
Pushrods Included: No
Rocker Arms Included: No
Gaskets Included: No
Valve Springs Required: Yes
Quantity: Sold as a kit.
Notes: Pre-1968 engines require different lifters.