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What are the specs on a thumper cam?

What are the specs on a thumper cam?


  • RPM range: 2200-6100.
  • Valve timing: .006.
  • Lobe-center angle: 107.
  • Intake centerline: 102.
  • Valve lash: intake/exhaust – hydraulic.
  • Duration: 287 intake, 305 exhaust.
  • Duration @ .050″ life: 235 intake, 249 exhaust.
  • Valve lift: .489 intake, .476 exhaust.

How much does a Thumpr Cam cost?

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What are the differences between flat tappet hydraulic and roller camshafts?

The flat-tappet cam lobe is more pointed at peak lift, while the roller cam nose tends to be rounded; this means the roller is holding the valve open at higher lift for a longer period of time, which results in a greater fuel/air charge. The lobe shape also opens the valve much faster.

What is considered a big cam?

It is listed in degrees of crankshaft rotation. When someone refers to a “big cam,” they mean it has longer duration, not higher Lift. Duration at 0.050″ is the degrees of crankshaft rotation between when the lifter is raised 0.050″ and when it is 0.050″ from its resting position.

Are lunati camshafts any good?

Lunati cams are quality items with good engineering and performance. A lot of east coast guys bought them. They were so successful Holley bought them out a few years ago as part of their Systemax approach to integrated performance parts to go with their carbs and intakes.

What kind of Cam does a Big Mutha thumpr use?

Big Mutha’ Thumpr™ 243/257 Hydraulic Roller Cam for OE Roller SBC 305-350. Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle.

What kind of compression does a thumpr Cam get?

Id want at least 10:1 compression with the 280 magnum and 2500-3000 stall. The thumpr will work with a little less compression and stall. The thumpr will get horrible gas mileage. Fwiw, I lost 2 295 thumpr cams in my last motor.

Is the thumpr Cam a good carb?

And it is very difficult to tune the carb due to the very low vacuum (6″ at 1000 rpm idle). The very low vacuum also means that you won’t have reliable power brakes, even with a vacuum canister. IMO – avoid it unless you are 16 year old.

What do you need to know about COMP Cams?

COMP Cams has developed the Thumpr series of cams that give you every day drivability, but have that nasty race engine sound. Pick the cam that fits your application, add a set of Comp Cam hydraulic lifters and you will be the talk of the town. High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle.