Description
COMP Cams 10-602-11 – Camshaft A8 299THR7 Thumper
Big Mutha’ Thumpr 243/257 Hydraulic Roller Cam for AMC 290-401
Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very 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.
Camshaft Series: ThumprUsage: Street/PerformanceCam Type: Hydraulic RollerGrind Number: 299THR7Basic Operating RPM Range: 2,500-6,400Intake Duration at .050 Inch Lift: 243Exhaust Duration at .050 inch Lift: 257Advertised Intake Duration: 299Advertised Exhaust Duration: 319Lobe Separation: 107Intake Valve Lift: 0.552Assembly Lubricant Included: NoCamshaft Gear Attachment: 1-BoltCamshaft Material: Billet SteelEngine Family: American Motors 290-401 c.i. 8 Cylinder (1966-1991)Valve Springs Required: YesLifters Included: NoExhaust Valve Lift: 0.537Lifter Type: Hydraulic RollerAmazon ASIN: N/AC.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?: NoC.A.R.B. Exemption Reason: N/AC.A.R.B. E.O. Number: N/AGrind Number: 299THR7
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