Houle #382
Well-Known Member
Anyone running the Comp Cams Mutha' Thumper cam 235/249 in their 440 ? Just wonder what kind of performance increases you got.
Just had a 355 SBC with one on the dyno here.
The criteria for the build was, over 400hp, rowdy idle.
The build was very bread and butter.
Flat top hypereutectic pistons, ootb E Street heads, RPM A/G, the middle Thumper cam.
Made over 425tq/425hp so far. The carb they were using was pretty lean and they’ve ordered a carb for the motor(which will get tuned to the motor), so there may be a few ponies left in it.
Idles at 6” vacuum(pretty rough).
Those lobes are pretty smooth and easy on parts.
I wouldn’t recommend it for power brakes or the FITech/Sniper type EFI.
Well, you asked about the Mutha Thumper, so I assumed you knew what the specs were.
This one is a HFT, part number 12-601-4
For the Chevy lifters the specs are:
287/[email protected]
235/[email protected]
.489/.476 w-1.5
107lsa
The Mopar version has a little more lift since it uses .904 specific lobes.