why the hell would fuel system cleaner fix tapping in the head :slap:


on another note, i'm not sure of the milage of your motor but there is a posibility that the wear patern on your cam lobes is off due to accessive wear and it could be making the taping noise due to an in-consistantly sized cam lobe.

or, maybe your missing a rod bearings & the rod is slapping against the crank as it goes up & down! it's hard to say without hearing it..but how many miles are on your engine & whats the condition of it..