Big Mutha’ Thumpr 243/257 Hydraulic Roller Cam for Chevrolet Big Block GEN VI

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: 00036584211952
Camshaft Series: Thumpr
Usage: Street/Strip
Cam Type: Hydraulic Roller
Grind Number: 299THR7
Basic Operating RPM Range: 2,500-6,200
Intake Duration at .050 Inch Lift: 243
Exhaust Duration at .050 inch Lift: 257
Advertised Intake Duration: 299
Advertised Exhaust Duration: 319
Lobe Separation: 107
Intake Valve Lift: 0.569
Exhaust Valve Lift: 0.554
Lifters Included: No
Valve Springs Required: Yes
Assembly Lubricant Included: No
Camshaft Gear Attachment: 3-Bolt
Camshaft Material: Austempered Ductile Iron
Engine Family: Chevrolet GEN VI 454 and 502 c.i. 8 Cylinder (1996-1999)
Cam and Lifter Kit Upgrade: CL01-602-8
California Proposition 65: WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov
K-Kit Upgrade: K01-602-8
Lifter Type: Hydraulic Roller
Amazon ASIN: B005H89P7O
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.
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

Packaging:

Quantity of Each: 1
Package UOM: EA

PDF:

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