High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle. K12-601-4 contains the following: 12-601-4 Mutha’ Thumpr 235/249 Hydraulic Flat Cam for Chevrolet Small Block, 812-16 High Energy Hydraulic Flat Lifter Set for Chevrolet Small and Big Block., 2100 Magnum Double Row Timing Set for ’78-’86 Chevrolet V6 and 265-400 Small Block, 981-16 Set of 16 Single Springs w/ 1.254″ O.D., 1.254″ I.D., 1.700″ Installed Height, 601-16 Hardened Steel Set of 16 – 7 Degree, 11/32″, Single Groove Street Locks, 742-16 7 Degree Steel Retainer Set of 16 for SBC, Chevrolet/Buick V6 w/ 1.250″ OD Spring, 501-16 Set of 16 O-Ring Valve Seals for Stock Guide Size, 11/32″ Valve Stem
Product 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
- K Kits vary in their contents, but generally contain a camshaft, a set of lifters, valve springs, retainers, locks, valve seals, timing set, assembly lubricant, decals and instructions. Check description for more accurate listing of kit contents.
- 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
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…
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.
I love this camshaft!!! Great camshaft I love the sound and performance. in my opinion the recommended stall converter for this set up is a little to conservative. you need to put a 2800 stall or higher torque converter on to run this cam on a street car.