DeTomaso Mailing List: November 2000, Message #175

I have to wonder if the high RPM clutch slip is more of a problem with a very 
high RPM engine. I think it's the torque not the HP that is the issue. While 
the HP may continue to climb above 5000 on the engine Mark described, I doubt 
the torque does. On the "monster motor" Pantera, maybe the torque continued 
to raise above 4500. And, if the clutch was slipping due to massive torque 
about 5000 RPM, I'd expect it to be pretty obvious, i.e., the RPM would shoot 
up, but no acceleration to go with it.

I'd think there are several other answers. Years ago I one put a Hooker side 
exhaust system on a 435 HP 67 Vette. But, I ordered their quiet mufflers. The 
car took off like e rocket, but at some RPM I can't remember, the power went 
away. I switched to glass packs, and it fixed everything.

There are of course other things. If the loss of power is immediate, maybe 
the power valve, or some other single point failure. But if the power loss is 
gradual, maybe the cam timing? Not jetted right, ignition giving out, etc.

I'd probably go to a dyno tune shop that knows Holleys, and get them to do 
their magic. It seems that most people don't go this route because we hate to 
spend a couple bills for a tune up, But everyone who has done it seems to 
think it was money well spent. In your case, I imagine you'd get a quick and 
correct diagnosis, and the money would be well spent.

Ken