You can go Small base circle and cure the problem. You will need longer push rods to compensate. It really is a quick fix to just grind the back side of those 2 rods. let me take a guess.... #2, and #5 cylinders? Or #2 and #6. I dont run .060 clearnce. .015 is all i do. Never hit one yet. i guess there is always a first time.