Ya know, Midgets & Sprint cars don't run balancers and do not experiance problems "or none I've ever seen or heard about"... I just finished building a limited 305 chevy for the kids sprint car and because we are running the standard water pump I put a new 6 inch lightweight balancer on it. Guess we'll see if that cast crank holds up..... I would never run anything except an 8 inch balancer on any of my street vehicles as I would rather be safe than sorry,only reason for the small one on the 305 sprint motor is I'm lookin for every thing I can get within the rules........