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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,575
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...except Dilivar!
Realistically, you can reuse the OE steel head studs if they are not significantly corroded. If they have any more than surface corrosion, you should consider new ones, because the pitting will eventually lead to "stress corrosion cracking." Those pits cause stress concentration,just like a sharp machine edge or other sharp points. The stud is under constant tensile stress, but that stress also varies due to thermal cycles. The largest changes are due to start up and shutdown, but there are also variations in stress due to operating at different power settings. Therefore, eventually, cracks may propagate through the stud and crack it.
Bottom lines: If in doubt, replace it. Otherwise, you can reuse the steel studs. I personally like to clean them and epoxy paint them to help prevent future corrosion.
Those of you building and running race motors, do whatever works for you.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
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