[gtofreek]

Originally Posted by Formulajones

Okay so what I have pictured is an old set that supposedly everyone was having issues with because the oil band is in the wrong location.

If that's the case, then why did these work perfectly fine in dad's engine???

I think it boils down to lifter bore clearance. The engines I have had noise issues with had less than .002" clearance. I feel engines with more than .002" clearance have sufficient clearance to get enough oil past to satisfy the lifter. The tight ones don't. Recommended lifter bore clearance is .0015"-.0018". Many I measure have .0025" or more, depending on lifter size, which I have seen all over the board with lifters.