if you know who ground it, they would be the ones to ask. Different grinders use different clearances. Ford original spec was .010 intake/ .013 ex. Many others prefer .013 in/.015 exhaust to avoid valve burn. I just got a new .330 lift cam from Bill Stipe ( excellent mid range performance, BTW) and he said to set it at .012 for both because of the way he ground the ramp.