Quote:

They are correct! All you have is a very slight "overbalance" due to the lighter pistons. You didn't say what your bobweight is---probably in the 1600-1700 gram range. This 9 grams would be only 1/2% overbalance. Many high RPM engines use 1,2 or even 2 1/2% overbalance. Some shops overbalance 1% for everything but street engines.

What you don't want is an "underbalance" situation.




I dont remember the exact numbers but engine builder/tester David Vizard did some testing with overbalancing and found out there was free HP to be had. I think he found like 15 free HP by adding a slight overbalance on a 350 chevy. So like stated above mike