COMP Cams CL31-600-9 Thumpr 227/241Hydraulic Roller & Evolution Lifter Kit, Ford 221-302
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The COMP Cams Thumpr camshafts delivers signature lopey idle, strong low-mid RPM torque, and improved horsepower. Ideal for street/strip builds looking for aggressive sound, throttle response, and classic muscle performance.
The COMP Cams Thumpr camshaft delivers a signature lopey idle, strong low- to mid-RPM torque, and improved horsepower, making it ideal for street/strip builds seeking aggressive sound, throttle response, and classic muscle performance. Designed for high-performance street applications, it provides an unmistakable idle quality while pairing exceptionally well with popular upgrades like the Edelbrock RPM Air Gap intake manifold and TCI Saturday Night Special torque converter. Built withfull-size base circles for added durability, this cam works seamlessly with COMP Cams Evolution hydraulic roller tappets and eliminates the need for dog bones and lifter retainersβcomponents never intended for pre-1985 applications. This camshaft supersedes part number CL31-600-8, delivering proven performance and simplified valvetrain compatibility in one upgraded design.
Features
- Features full-size base circles, works seamlessly with our Comp Cams Evolution hydraulic roller tappets.
- Eliminates the need for dog bones and lifter retainers, which were never intended for use in pre-1985 applications.
- Supersedes CL31-600-8
Specifications
| Exhaust Lobe Lift | 0.322 IN |
| Intake Lobe Lift | 0.332 IN |
| Exhaust Valve Lift with Factory Rocker Arm Ratio | 0.515 IN |
| Intake Valve Lift with Factory Rocker Arm Ratio | 0.531 IN |
| Factory Rocker Ratio | 1.6 |
| Intake Centerline | 102 DD |
| Lobe Separation | 107 DD |
| Basic Operating RPM Range | 1900 - 5600 R3 |
| Intake Duration .050 Inch Lift | 227 DD |
| Exhaust Duration at .050 inch Lift | 241 DD |
| Advertised Intake Duration | 283 DD |
| Advertised Exhaust Duration | 303 DD |
| Advance | 5 DD |
| Cross sell / Upsell Part Numbers | 89311-16, 1431-16, 431M, 26986-16 |
| Camshaft Material | Billet Steel |
| Engine Platform | Ford Small Block |
| Firing Order | FS/FF |
| Exhaust Valve Lash | Hyd |
| Intake Valve Lash | Hyd |
| Cam Type | Hydraulic Roller |
| Computer Controlled Compatible | No |
| Direct Injection | No |
| Fuel Management Strategy Compatible | No |
| VVT Compatible | No |
| Lifter Type | Roller Tappet |
| Camshaft Series | Thumpr R3 |
| Valve Springs Required | Yes |
| Lifters Included | Yes |
Installation Guide: Download PDF
β οΈ 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.
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.
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Free shipping is available for eligible orders.
Shipping: For USA - Up to 50lbs.
Orders are processed during normal business days. Delivery dates may vary by carrier and destination.
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