I have a concern about lifter tap and spoke to FRPP/AFR and comp. The normal sewing machine noise is no problem but just off idle, 1200-1300+ rpm it has a lifter tap and its driving me crazy. I have changed cams, comp and e cam, changed lifters and adjusted preload numerous times from 1/4 to 1 turn, I still have the problem. Changed roller rockers twice, different manufacturers, FRPP sugested the flow restricted push rods but we dedcied on a straight 40 wt oil to test ..no difference. This is a new motor stock block and afr 165 r heads. Changed pushrods and rocker arms twice for testing. Comp cam is quieter as sewing machine noise but no change in lifter tap above idle. Two oil pumps have been used and oil pressure was good on both?????????????????
I noticed plenty of high lift high horsepower motors with very little noise...any help would be wonderfil...I'm very good at upper intake and valve adjust now!!!!!
I noticed plenty of high lift high horsepower motors with very little noise...any help would be wonderfil...I'm very good at upper intake and valve adjust now!!!!!