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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 retainers—components never intended for pre-1985 applications. This camshaft supersedes part number 31-600-8, delivering proven performance and simplified valvetrain compatibility in one upgraded design.
COMP Cams® is the leading American manufacturer of high-quality, performance-based internal engine components, including camshafts, valve springs, rocker arms, lifters, pushrods, and other valve train components. We help our customers with innovative technological advancements through extensive research and development. Our quality workmanship and engineering ensure confidence for racers and street performance enthusiasts. COMP Cams is a proud member of the Edelbrock Group family of brands, which include Edelbrock®, FAST® (Fuel Air Spark Technology), TCI® Automotive, Russell® Performance and Lunati Power®. Headquartered in Olive Branch, Mississippi, COMP Cams remains an innovative American company focused on results-driven technology and superior customer support. We believe in the automotive lifestyle and continue to support the passion for our American pastime. For more information about the Edelbrock Group or any partner brands, visit www.edelbrockgroup.com.
| Advance | 5 |
|---|---|
| Advertised Exhaust Duration | 303 |
| Advertised Intake Duration | 283 |
| Basic Operating RPM Range | 1900 - 5600 |
| Cam Type | Hydraulic Roller |
| Camshaft Series | Thumpr |
| Computer Controlled Compatible | No |
| Country Of Origin | USA |
| Cross Sell / Upsell Part Numbers | 89311-16, 1431-16, 431M, 26986-16 |
| Direct Injection | No |
| Engine Platform | Ford Small Block |
| Exhaust Duration At .050 Inch Lift | 241 |
| Exhaust Lobe Lift | 0.322 |
| Exhaust Valve Lash | Hyd |
| Exhaust Valve Lift With Factory Rocker Arm Ratio | 0.515 |
| Factory Rocker Ratio | 1.6 |
| Firing Order | FS/FF |
| Fuel Management Strategy Compatible | No |
| Intake Centerline | 102 |
| Intake Duration At .050 Inch Lift | 227 |
| Intake Lobe Lift | 0.332 |
| Intake Valve Lash | Hyd |
| Intake Valve Lift With Factory Rocker Arm Ratio | 0.531 |
| Lifter Type | Roller Tappet |
| Lobe Separation | 107 |
| Material | Billet Steel |
| Valve Springs Required | Yes |
| VVT Compatible | No |
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)).
WARNING: This product can expose you to Zinc Dithiophosphate, Paraffinic Pertroleum Oil, Anthraquinone Dye, known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.
California carb status to be completed
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