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
- 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.
Extened 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
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