Description
High performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping idle.1,800-5,600 RPM Operating Range227/241 Duration at .050″. 107 Degree Lobe Separation Angle. 0.498″/0.483″ Valve LiftCL Kits include a camshaft, a set of lifters, instructions and assembly lubricant.Early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note. Best with aftermarket converters and more rear gear.Perfect choice for muscle cars and street rods – Three unique cam designs: Thumpr, Mutha’ Thumpr and Big Mutha’ Thumpr deliver excellent horsepower gains and broad torque curve.Fits Chevrolet 396-454 Mark IV Big BlockMade in USA
High performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping idle.
| Thumpr | Mutha’ Thumpr | Big Mutha’ Thumpr | |
|---|---|---|---|
| Performance Characteristics | High performance street, stock converter ok, best with 2,000+ converter and gears. Choppy/thumping idle. | High performance street/strip, needs 9:1 compression, 2,500+ stall, intake, gears and headers, rough idle. | Street/strip, needs 9.5:1 compression, 2,800+ stall, intake, gears and headers, very rough idle. |
| RPM Operating Range | 1,800 to 5,600 | 2,000 to 5,900 | 2,300 to 6,200 |
| Advertised Duration (INT/EXH) | 279/296 | 287/304 | 294/312 |
| Duration at .050″ (INT/EXH) | 227/241 | 235/249 | 243/257 |
| Valve Lift w/ 1.7 Rocker (INT/EXH) | .498″/.483″ | .510″/.495″ | .522″/.507″ |
| Lobe Separation Angle | 107 | 107 | 107 |
| CL-Kit | CL11-600-4 | CL11-601-4 | CL11-602-4 |
| GK-Kit | GK11-600-4 | GK11-601-4 | GK11-602-4 |
| K-Kit | K11-600-4 | K11-601-4 | K11-602-4 |
| Made in the U.S.A. | ✓ | ✓ | ✓ |
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