I read that most prefit piston ring sets are undersized by up to +.030. I am
guilty on just slippin the rings on in the past, thinking they were right for the application from the factory. I know now that .016 to .018 is a correct gap to use. Is it true that you can give away 20-30 hp by not checking end gap?
Does any brand offer correct prefit sizeing or is it file fit from now on? Thanks.