COMP Cams - 11-601-8
Camshaft - Mutha' Thumpr - Hydraulic Roller - Lift 0.558 / 0.542 in - Duration 291 / 311 - 107 LSA - 2000 / 5800 RPM - Big Block Chevy - Each
High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle.
Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods, the Thumpr series' early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally, Thumpr camshafts typically deliver reduced vacuum at idle, making a vacuum canister, pump or hydroboost a requirement for vehicles running power brakes.
C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?: Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for On-Road Vehicles?: No
C.A.R.B. Exemption Reason: N/A
C.A.R.B. E.O. Number: N/A
Camshaft Series: Thumpr
Usage: Street/Performance
Cam Type: Hydraulic Roller
Grind Number: 291THR7
Basic Operating RPM Range: 2,200-5,800
Intake Duration at .050 Inch Lift: 235
Exhaust Duration at .050 inch Lift: 249
Advertised Intake Duration: 291
Advertised Exhaust Duration: 311
Lobe Separation: 107
Intake Valve Lift: 0.558
Exhaust Valve Lift: 0.542
Lifters Included: No
Valve Springs Required: Yes
Assembly Lubricant Included: No
Camshaft Gear Attachment: 3-Bolt
Camshaft Material: Austempered Ductile Iron
Engine Family: Chevrolet 396-454 c.i. 8 Cylinder (1967-1996)
Cam, Lifter and Gear Drive Upgrade: GK11-601-8
Cam and Lifter Kit Upgrade: CL11-601-8
K-Kit Upgrade: K11-601-8
Lifter Type: Hydraulic Roller
Amazon ASIN: B0014F35T8
C.A.R.B. Exempt for Racing and Off-Road Only Vehicles?: Yes, but must be a race/competition only vehicle.
C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
