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Old 10-19-2021, 10:35 AM   #1
chuckwp
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Default Exhaust manifold bolt size

'37 Flathead V8. Are all the exhaust manifold bolt holes supposed to be 3/6"-16? The front holes on the one I am working on are messed up. They seem to be 7/16" partway and 3/8" the rest of the way, with the outer part being the 7/16" dimension. No sure what is going on here. I suspect someone has done something jiggy>
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Old 10-19-2021, 12:17 PM   #2
chuckwp
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Default Re: Exhaust manifold bolt size

Never mind. I figured it out. They are 7/16"-14.
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Old 10-19-2021, 02:34 PM   #3
Big hammer
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Default Re: Exhaust manifold bolt size

Wow I thought I was in the wrong forum, then I see you where.
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Old 10-19-2021, 09:01 PM   #4
Flathead
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Default Re: Exhaust manifold bolt size

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The front two holes are supposed to be 7/16, rest of holes are 3/8.
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