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: 00036584177852
Advertised Exhaust Duration: 304
Advertised Intake Duration: 287
Amazon ASIN: B002EE6GF8
Assembly Lubricant Included: Yes
Basic Operating RPM Range: 2,000-5,900
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 Type: Hydraulic Flat Tappet
Camshaft Gear Attachment: 3-Bolt
Camshaft Material: Nitrided Cast 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: 0.495
Grind Number: 287TH7
Intake Duration at .050 Inch Lift: 235
Intake Valve Lift: 0.51
Lifter Type: Hydraulic Flat Tappet
Lifters Included: No
Lobe Separation: 107
Usage: Street/Strip
Valve Springs Required: Yes
Extended Information:
Emissions : EPA Eligible
Life Cycle Status: Available To Order
Packaging:
Quantity of Each: 1
Package UOM: EA
Dimension: 23.38 x 2.83 x 2.59 inches
Weight: 10.65 PG
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