COMP Cams CL12-601-4 Mutha' Thumpr 235/249 Hydraulic Flat Cam and Lifter Kit Chevrolet Small Block
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Availability:
Only 5 left in stock, order soon!
Arrives
Tuesday, Sep 29
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Size: Cam and Lifter Kit
Style: 2,200-6,100 RPM Range
Features
- High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle.
- 2,200-6,100 RPM Operating Range
- 235/249 Duration at .050". 107 Degree Lobe Separation Angle. 0.489"/0.476" Valve Lift
- CL 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 GEN 1 Small Blocks including the 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400. Does not fit LT1/LT4, or factory roller Small Blocks built from 1985 and newer.
- Made in USA
Description
High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle.
Manufacturer: COMP Cams
Brand: Comp Cams
Model: CL12-601-4
Item Weight: 13.05 pounds
Product Dimensions: 25.4 x 5.5 x 3 inches
Item model number: CL12-601-4
Exterior: Per Item Description
Manufacturer Part Number: CL12-601-4
OEM Part Number: N
Date First Available: June 23, 2009
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Sep 29
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: Cam and Lifter Kit
Style: 2,200-6,100 RPM Range
Comp cams are the best. I have a very long story here. I will try to keep it short, but what I have to say may be helpful. Originally I purchased the Performer RPM package. I researched everything and was told by few that the RPM cam was the best choice because it has been dyno matched with the heads and intake. I ran the RPM cam and lifters and I was very disappointed with the results. THEN, I heard my rockers ticking as if they were loose. After proper cam break in of cam lube and high zinc break in oil, the RPM cam rounded out 2 lobes and about 4 lifters were damaged. In my experience, the RPM cam and lifters are crap. I purchased the Comp Cam and the power difference was very noticeable, the sound was more aggressive, and the throttle response was more snappy. I'm VERY happy with this cam.
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Reviewed in the United States on December 31, 2018 by Mary
Size: Cam and Lifter Kit
Style: 2,200-6,100 RPM Range
Badass cam for the money nice sounds your looking for, nice for a Street hot rod build. It sounds like a racecar lol, and fit well with no issues. When you get into this one you will feel it lol
Reviewed in the United States on August 18, 2025 by Dylan Tibbs
Size: Cam and Lifter Kit
Style: 2,200-6,100 RPM Range
This is a great cam! I put it in my boat and it has an awesome sound and makes good power, I have no complaints and have bought a second cam for a project car.
Reviewed in the United States on October 31, 2014 by brian harwood
Size: Cam and Lifter Kit
Style: 2,200-6,100 RPM Range
Great cam people say these cams are all sound but if your car or truck is tuned right this is a great cam the duration and overlap is really close to an older dirt track cam they had
Reviewed in the United States on March 4, 2016 by Kolby-
Size: Cam and Lifter Kit
Style: 2,200-6,100 RPM Range
There was no mention as to the fit with a stroked small block Chevy. Be advised that if you are running a stroke longer that 3.75" that you will need to clearance your rods to avoid cam lobe contact or return this camshaft. You need a small base circle if you don't want to clearance your rods. THIS CAM WILL NOT WORK and it should be noted in the description, but is not.
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Reviewed in the United States on January 22, 2024 by Amazon Customer
Size: Cam and Lifter Kit
Style: 2,200-6,100 RPM Range
For the money it's a good product
Reviewed in the United States on July 21, 2017 by Noah & Rachel
Size: Cam and Lifter Kit
Style: 2,200-6,100 RPM Range
Great product this cam has my car sounding like a monster.
Reviewed in the United States on November 5, 2017 by Ceasar
Size: Cam and Lifter Kit
Style: 2,200-6,100 RPM Range
requires a very high idle. and worst of all pretty much lost all power to my brakes. requires to much vacuum pressure. be prepared to spend more on an external vacuum air pump if u want decent braking abilities
Reviewed in the United States on June 28, 2019 by Amazon Customer