Description
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.
Additional Attributes:
GTIN: 00036584150909
Advertised Exhaust Duration: 311
Advertised Intake Duration: 291
Amazon ASIN: B0014F35T8
Assembly Lubricant Included: No
Basic Operating RPM Range: 2,200-5,800
C.A.R.B. E.O. Number: N/A
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 Federally Certified Vehicles Manufactured Before 1967?: 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. Exempt for Racing and Off-Road Only Vehicles?: Yes, but must be a race/competition only vehicle.
C.A.R.B. Exemption Reason: N/A
California Proposition 65: WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
Cam and Lifter Kit Upgrade: CL11-601-8
Cam Type: Hydraulic Roller
Cam, Lifter and Gear Drive Upgrade: GK11-601-8
Camshaft Gear Attachment: 3-Bolt
Camshaft Material: Austempered Ductile Iron
Camshaft Series: Thumpr
Engine Family: Chevrolet 396-454 c.i. 8 Cylinder (1967-1996)
Exhaust Duration at .050 inch Lift: 249
Exhaust Valve Lift: 0.542
Grind Number: 291THR7
Intake Duration at .050 Inch Lift: 235
Intake Valve Lift: 0.558
K-Kit Upgrade: K11-601-8
Lifter Type: Hydraulic Roller
Lifters Included: No
Lobe Separation: 107
Usage: Street/Performance
Valve Springs Required: Yes
Extended Information:
Emissions : EPA Eligible
Life Cycle Status: Available To Order
Packaging:
Quantity of Each: 1
Package UOM: EA
Dimension: 24.5 x 3 x 2.75 inches
Weight: 10.22 PG
Reviews
There are no reviews yet.