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Comp Cams Part Number 11-601-8 is a Mutha' Thumpr 235/249 hydraulic roller camshaft designed for Chevrolet Big Block 396–454 engines (1967–1996). Known for its aggressive idle and strong torque curve, this camshaft provides the signature Thumpr sound while delivering excellent mid-range performance. Ideal for street/ performance builds seeking both sound and power.
Mutha' Thumpr series hydraulic roller camshaft
Aggressive, choppy idle with strong street performance
Designed for big block Chevrolet 396–454 engines
Broad 2,200–5,800 RPM operating range
3-bolt camshaft gear attachment
Excellent midrange torque
| Specification | Value |
|---|---|
| Camshaft Type | Hydraulic Roller |
| Series | Thumpr |
| Engine Family | Chevrolet 396–454 c.i. (1967–1996) |
| RPM Range | 2,200–5,800 |
| Advertised Duration (Int/Exh) | 291 / 311 |
| Duration @ .050" (Int/Exh) | 235 / 249 |
| Valve Lift (Int/Exh) | 0.558 / 0.542 |
| Lobe Separation Angle | 107° |
| Intake Centerline | 102° |
| Intake Open (BTDC) | 42° |
| Intake Close (ABDC) | 69° |
| Exhaust Open (BBDC) | 82° |
| Exhaust Close (ATDC) | 49° |
| Valve Timing @ .006" | Not specified |
| Gear Attachment | 3-Bolt |
| Usage | Street/Performance |
| Lifter Type | Hydraulic Roller |
| Warranty | 12 Months |
| UPC | 036584150909 |
| Emissions Code | Not specified |
| California Proposition 65 | Cancer and Reproductive Harm (P65Warnings.ca.gov) |
Make: Chevrolet
Engine Family: 396 / 402 / 427 / 454 c.i. Big Block V8
Model Years: 1967–1996
Cam Gear Style: 3-bolt
