[Stan Weiss]

Originally Posted by mysticmissle

actaully those look like isky sbc guide plates, that may be part of the issue. the U in the guide plate may not be deep enought to your point. the hole in the head looks like its been clearanced for 1.65 or more ratio rockers but hard to say, not knowing the history.
but why did pontiac install millions of guide plates on heads if the rockers would have stayed straight the whole time without them?

I can be wrong (will not be the first time) but I think that that ball / stamped stud rocker arms have more movement that the stud rollers do.

Stan