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Broken EXHAUST manifold bolts: Why GM, WHY ??

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Old 05-01-2024, 01:54 PM
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I disagree with that. The same amount of heat is in there. Also we are still seeing broken bolts in Gen IV which do not have a 4 corner.

Correlation =/= causation and I think that is very true in this case.
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Old 05-01-2024, 03:27 PM
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Originally Posted by 54inches
... answer: Heat spots on those back two cylinders...
LOL The aluminum in the cylinder heads holds up but steel studs can't take the temperature.
Old 05-17-2024, 12:10 AM
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Huron Speed manifolds came with some kind of gold tone plated exhaust bolts. I think they said grade 8.8
Think they will hold up okay ?
Should I use regular gray Antisieze on them, or run 'em in there dry ?
Nice looking Stainless manifolds, beautiful welds.
Old 05-17-2024, 05:03 PM
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i always just gave a daily soaking of PB Blaster for a week prior to removing them, and i had no issues.
Old 07-10-2024, 07:06 PM
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Flaw ith the block design with how the bolts go in. Plus over torqued bolts from the factory. High heat area with repeated thermal cycling to boot.
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