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1966 coupe and 1970 sportsroof
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Discussion Starter · #1 ·
Can anybody tell me what size bolt I need to bolt the exhaust clamp to my stock 289 manifold studs?

I have a dual exhaust, but I'm missing the bolts on the drivers side. The exhaust is welded on but the clamp is swinging loose and the clamp has slid down the pipe!

It runs great, I've only just noticed this after owning the car for almost a year and driving it about 5000 miles!

Still runs and sounds good!

Thanks

Shaun
 

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5/8. If you can find some brass ones use them, they won't weld themselves to
the manifold. If not use a tone of anti-seize. Make sure you don't overtighten
them and try to put them on equally. Don't let the clamp go on crooked

<P ID="edit"><FONT SIZE=-1>Edited by opentracker on 03/28/01 06:15 PM (server time).</FONT></P>
 

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37,997 Posts
What are you trying to say? Do you mean the FLANGE that holds the "H" pipe to the manifold (by the 2 studs) is not connected? IIRC the nuts are 3/8NF. I don't know what you mean by the pipe is welded on, but I sure hope that someone didn't weld it up to the manifold. If you mean that the manifold is missing the studs AND bolts, you can get the right studs and bolts at your local auto parts store.
PS, brass nuts work better than steel.

'66 A-code Fastback (therapy)
'89 Town Car (SWMBO D'driver)
'87 Caprice (as req'd by Hagerty)
 

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hmmm....the studs on my D-coder exhaust manifolds are 7/16 NC (14)....

Does that help?

Pat
http://albums.photopoint.com/j/View?u=1570936&a=11937754&p=42910787.jpg
 

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1966 coupe and 1970 sportsroof
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5,370 Posts
Discussion Starter · #5 ·
What I mean is...

On the drivers side exhaust, the flange/clamp that should be around the exhaust bolted to the exhaust manifold, has slipped down the exhaust pipe because it's not even bolted on!

The studs are sticking out of the manifold and the exhaust (I presume) is welded onto the manifold. If it wasn't welded, surely it would of made a REALLY loud noise this past year.

Now, I've driven the car 5000 miles since I bought it and it must of been like that since then!

It's amazing! What I obviously want to do is bolt the flange/clamp back onto the manifold studs. What size bolts are they?

Thanks

Shaun
 

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1966 coupe and 1970 sportsroof
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5,370 Posts
Discussion Starter · #6 ·
OK guys...

3 replies and 3 different sizes so far...

Maybe I should just take one off the other side and take it to Ace Hardware...

Thanks

Shaun
 

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37,997 Posts
The more I think about it, I think Pat is right, they are 7/16NC which means a 5/8 socket or wrench is needed to remove/install. The reason the pipe is not loose is that the right side is keeping pressure on it through the H connector, probably. Slide the flange back up the pipe, over the studs and get some brass nuts and spin 'em on down!

'66 A-code Fastback (therapy)
'89 Town Car (SWMBO D'driver)
'87 Caprice (as req'd by Hagerty)
 
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