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The original Olds factory studs are 3/8" threads on BOTH ends. Can't tell from TPP's auction pic if theirs is 3/8 on both ends OR if the shorter upper part is 5/16" and they don't say anything about thread size in the text/description. It may be an optical illusion but it almost looks like the upper part thread size is one step smaller compared to the bottom part (5/16 and 3/8).
AMK Products shows a correct sized stud that is 3/8 on both ends...their PN is 11043 and it's $5 but they have a $30 minimum on orders. Theirs is plated in clear zinc (silver) but that can be stripped off and replated in phosphate, etc for a aluminum intake W car or painted over on a cast iron intake car. I just measured an original and it's the same dimensions as the AMK piece.
Here's a pic of an original stud:
Last edited by 70Post; January 1st, 2021 at 08:29 AM.
The more I stare at the pic in the TPP ebay auction, the more I think that it's not an optical illusion....the upper part sure looks like 5/16" instead of the factory 3/8 size. I even held a dial caliper up against the screen and compared the two ends.
January 1st, 2021, 01:34 AM
