Guess what ? Im back in .YR one time long long ago on a bb chevy you know what cured reversion retarding the cam from +4 to straight up.Where did you get your answer from Iskys tech tips?If you look at the overlap triangle the exh valve is open more than the int. therefore allowing less reversion.Not that I dont like your opinions because i know your mostly blowing hot air,I just dont like you!!!Most of what you print is bullshit, with your tough attidude your trying to justify being right.