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COMP Cams 11-601-8 Mutha' Thumpr 235/249 Hydraulic Roller Cam for Chevrolet Big Block 396-454
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Enter your Engine Family Number and we will confirm whether this exact converter is street-legal for your vehicle.
High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, 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.
Specifications
| Exhaust Valve Lift | 0.542 IN |
| 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 |
| Camshaft Series | Thumpr |
| Usage | Street/Performance |
| Cam Type | Hydraulic Roller |
| Grind Number | 291THR7 |
| Basic Operating RPM Range | 2,200-5,800 R3 |
| Intake Duration at .050 Inch Lift | 235 DD |
| Exhaust Duration at .050 inch Lift | 249 DD |
| Advertised Intake Duration | 291 DD |
| Advertised Exhaust Duration | 311 DD |
| Lobe Separation | 107 DD |
| Intake Valve Lift | 0.558 IN |
| Grind Number | 291THR7 |
⚠️ California Proposition 65 Warning
California Residents: This product can expose you to chemicals which are known to the State of California to cause cancer or other reproductive harm. Please visit www.p65warnings.ca.gov for more information.
Warranty: 12 Months
Please check the product description for the manufacturer’s application details, or ask a specialist — we’ll confirm whether it fits your vehicle before you buy.
Shipping Information
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Shipping: Free to the USA.
Orders are processed during normal business days. Delivery dates may vary by carrier and destination.
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