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Old 04-13-2020, 12:07 AM   #1
cityhawk
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Default exhaust manifold-to-head studs

For some reason two of mine are missing. I'm inclined to replace them all with stainless steel studs/nuts. Does anyone know the correct size/thread of these studs?
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Old 04-13-2020, 01:26 AM   #2
454cid
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Default Re: exhaust manifold-to-head studs

Did they back out, or did they break off?
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Old 04-14-2020, 12:13 AM   #3
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Default Re: exhaust manifold-to-head studs

I just measured one and I believe they are M8-1.25.
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Old 04-14-2020, 11:01 AM   #4
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Default Re: exhaust manifold-to-head studs

Thanks Greg1!

And 454cid, I don't know. I can't see them from my vantage point, so they didn't break off at the surface, but it's possible that they broke off further in.

There is a garage that I have had extract difficult bolts from. I thought I'd get an estimate for them doing that and, assuming it's as reasonable as they usually are, I'll have them do the extraction of all the studs.
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Saturns:
1993 SW2 MT 209,000 hard Boston city miles ("Rozzie")
Gone but not forgotten:
2001 LW300 ("Elle")
1999 SW2 MT
Project cars:
1966 Corvair Monza convertible
1928 Ford Model A Tudor Sedan
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Old 04-23-2020, 05:22 PM   #5
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Default Re: exhaust manifold-to-head studs

I've always reused the intake studs from the wrecking yard with a bunch of nickel anti-seize on them.
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