Description
M-Thmpr 235/249 H-Rolr Cam OE Roller SBC
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.
| UPC | 036584171980 |
|---|---|
| Manufacturer | COMP Cams® |
| Emissions Code | |
| Engine Family | Chevrolet 305-350 c.i. 8 Cylinder O.E. Roller (1987-1998) |
| RPM Operating Range | 1,900-5,600 |
| Cam Type | Hydraulic Roller |
| Camshaft Series | Thumpr |
| Camshaft Gear Attachment | 3-Bolt |
| Usage | Street/Strip |
| California Proposition 65 | WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov |
| Advertised Intake Duration | 291 |
| Advertised Exhaust Duration | 311 |
| Intake Duration at .050 Inch Lift | 235 |
| Exhaust Duration .050 Inch Lift | 249 |
| Intake Valve Lift | 0.522 |
| Exhaust Valve Lift | 0.509 |
| Lobe Separation | 107 |
| Intake Centerline | 102 |
| Valve Timing Lift | 0.006 |
| Exhaust Close ATDC | 49 |
| Intake Open BTDC | 42 |
| Exhaust Open BBDC | 82 |
| Intake Close ABDC | 69 |
| Lifter Style | Hydraulic Roller |
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