COMP Cams CL12-600-4 Thumpr 227/241 Hydraulic Flat Cam and Lifter Kit for Chevrolet Small Block

High performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping idle.

Product Features

  • High performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping idle.
  • 2,000-5,800 RPM Operating Range
  • 227/241 Duration at .050″. 107 Degree Lobe Separation Angle. 0.479″/0.465″ 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

3 thoughts on “COMP Cams CL12-600-4 Thumpr 227/241 Hydraulic Flat Cam and Lifter Kit for Chevrolet Small Block”

  1. Very happy with this cam…. 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…

  2. good stuff

    Customer Video Review Length:: 0:14 Mins if you are looking for a cam that makes your engine sound meaner than it is. this is the one for you. all the headaches of a big cam without massive power gains. Its just what i wanted so i loved it. i daily drove a truck with this cam for a year gettin around 8mpg. every time you start it you’ll forget all about all the money you pay at the pump

  3. SAME GREAT PARTS was in good condition ,and installed in time for the rod run.. thanks for the same great parts i have used for 45 years..M.A.R.A.T.

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