Ya see; with 4 main bearings the crank
does a little 'dance' at 5500 RPM and
that puts it into "self destruct", at
about 5800-5900. That's the MAX.
Build the early model and just run it
in the 'normal' RPM range (up to 4500)
and enjoy... A few @ 5500 is okay but;
if you miss a shift, It's all over.
John -
I've had people tell me this story for years. We continually run a 12-Port GMC over 7,000 rpm and have not even hurt a bearing in 15 years. I think part of our success is a Fluid Dampner and torque convertor which absorbs alot of the harmonics.
Bob
