I've only done a little research so far, but I have ask Whipple about the ATI balancer, they say they always had good results using them.
Whether this is needed for our unbuilt motors is a good question.
Whipple produces some serious HP motors and are pleased with ATI Harmonic Balancers.
So I figure what the hell I'm going have the front of the engine taken apart anyway.
I still have to call ATI and find out the price and what's their take on using their balancer over a stock one
other than the tolerances are much higher with ATI's.
I have done a blue printed and speed balanced engine to 7000 rpm once before
and they used an ATI balancer and drilled small holes on the back side of it to get rid of vibrations and the desired rpm I paid for.
