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Old 02-27-2020, 10:53 AM
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Wagoneer Taylor Wagoneer Taylor is offline
258 I6
Join Date: Dec 17, 2018
Location: OR
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Originally Posted by 61Hawk
Aren't stainless steel bolts awful brittle?

Not sure about brittle, but stainless bolts are roughly equivalent to Grade 5 bolts as far as strength. Grade 8 is "stronger", I am sure it is fine to use stainless in this application. I am by no means an expert, but I use ALOT of stainless fasteners and material in my work. We use them not so much for the strength but the corrosion and heat resistance, strength just happens to be happy by product. I have found stainless to be more likely to seize or gale during installation, but when removing after a long time or many heat cycles they usually come out just fine. (we use them in heater blocks that got up to about 500 F)

I may have steered us a little off track but I thought this was a cool exercise of thinking about hollowed stainless bolts and how they might hold up to this same situation.
Some call me Taylor...

1977 Jeep Wagoneer (Wedding Wagon)
Soon to be a 401!
"Soon" is a relative term, also cracked cylinder put a hurt on me
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Old 02-28-2020, 08:22 AM
wiley-moeracing wiley-moeracing is offline
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Use anti seize when installing stainless steel.
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Old 03-06-2020, 04:01 AM
hojoos hojoos is offline
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Join Date: Feb 17, 2020
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The space around the bolt allows for thermal expansion of the exhaust manifold. Big chunks of cast iron expand quite a bit when they get as hot as exhaust manifolds do, and the manifolds would crack if they were not allowed to shift and "creep" around the bolts as they expand and contract. The bolt holes in the center of the manifolds are smaller because they are there to hold the center of the manifold in place while the far ends of the manifolds expand and contract. That is why the bolt holes out at the far ends are larger than the bolt holes in the center.
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