the pistons i took out of my 71 429 had two valve cut outs and all the pistons in books at parts store have only one cut out what am i to order also need them 60 over can only find 40 over . also what will comp rtio be 60 over dove-c heads

 

Order the pistons with one relief, and expect an increase in compression of about .6 points, with the overbore. This increase will not cause spark knock, as 385 series engines are very detonation resistant, especially D0VE's and equivelant.