Some are on center and some are offset a quarter inch. Different thoughts on what is best. I put 0.018 diameter holes on center in mine. Howards does a 0.021 diameter. Crower does 0.024 or 0.012. Comp Cams does 0.012
0.018 is about equal to a 1/16" diameter open hole in the oil system.
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70Z28 04B Norwood Forest Green-white Stripes Black DeLuxe Interior
Owned since 1978 - First Car
Last edited by BCreekDave; 01-25-2022 at 08:03 PM.
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