Guy brought this to me, new engine build, said high rpms there was a tapping sound, it ran great, no misses, ran it up to 4500 rpms and the tapping started. Checked all the top end, and was solid. Pulled the heads and behold, a piston was installed in the wrong direction, lucky he ran 450 lift cam,. Actually he ran Harlan sharp 1:6 rockers, which in turn made them 470 lift
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