Carb mounting bolt size

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Jan 8, 2017 | 12:42 PM

19FordBoy81

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Carb mounting bolt size

Hey guys. I'm new here. I have a 460 that I'm putting in my 81 bullnose. I'm installing the carb. But the only problem is I don't have the mounting bolts for it. Can anybody help. It's has stock intake for now.

Jan 8, 2017 | 12:44 PM

Franklin2

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It should have 1/2 studs. And they usually have a spacer, either plain or the EGR spacer. What have you got? They usually don't bolt on correctly without some sort of spacer.

Jan 8, 2017 | 01:06 PM

FuzzFace2

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From: Angier, NC

Quote:

Originally Posted by Franklin2

It should have 1/2 studs. And they usually have a spacer, either plain or the EGR spacer. What have you got? They usually don't bolt on correctly without some sort of spacer.

Would that be 1/2" studs above the plate you say it should have?

I think he wants the thread size? As a guess 5/16 -18 if you get threaded rod, washers and nuts you can make your own.
Dave ----

Jan 8, 2017 | 01:16 PM

Franklin2

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Sorry, the carbs do usually use 5/16 studs. The wrench size is usually 1/2". I have seen both 5/16-18 and the finer thread 5/16-24.

Jan 8, 2017 | 03:14 PM

19FordBoy81

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Thanks for the replies.It does have a egr spacer that goes in between the two. So 5/16 would be the correct size.

Jan 8, 2017 | 08:13 PM

WhatsAChevy?

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From: Northeast Ohio USA

Quote:

Originally Posted by 19FordBoy81

Thanks for the replies.It does have a egr spacer that goes in between the two. So 5/16 would be the correct size.

I used threaded rod due to using a Phenolic Thermal Manifold Spacer between the manifold and carb when I omitted the EGR spacer plate (and wanting new clean, sharp threads). Tractor Supply had plenty.