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Sep 17, 2011 | 09:07 PM

c4freak209

Thread Starter

3rd Gear

Joined: Sep 2011

Posts: 3

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From: ceres ca

please help

i have a 1985 corvette that im puttin back together and everywhere i go they say that the exhaust manifold bolts are discontinued and they cant even tell me what size and how big they need too be. can somebody please tell me what size they are or even where i can buy the set.

thanks, rick aka. c4freak

Sep 17, 2011 | 09:30 PM

87 vette 81 big girl

Melting Slicks

Joined: Nov 2008

Posts: 2,765

Likes: 5

Quote:

Originally Posted by c4freak209

Exhaust manifold bolt thread size is 3/8" X 16tpi.
Or same as 3/8" standard coarse thread , 16 threads per inch.

Length ?

Recheck with a tape measure what you need.
Check the exhaust manifold mounting flange(s) thickness with a tape measure.
And add at least 1/4" inch to allow enough thread engagement into your cylinder heads.

Sep 17, 2011 | 09:40 PM

Joe C

Race Director

Joined: Aug 2000

Posts: 11,470

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from what i'm seeing in the parts manual, the bolts are 3/8-16X2.00. there are also some studs - called out as 3/8-16X4.093 and used on the LH #3 hole. another stud, dimensions not called out, but used on #1-4 RH, and #3 LH holes. it's a little confusing -

- i would think the studs are used with brackets and braces for the alternator, and most likely the AC compressor. -??? - man, i hope this helps...

Last edited by Joe C; Sep 17, 2011 at 10:02 PM.

Sep 17, 2011 | 10:20 PM

c4freak209

Thread Starter

3rd Gear

Joined: Sep 2011

Posts: 3

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From: ceres ca

thank you to those who have answered ill go do my searching and homework now and see what happens.

thank you again.

Sep 17, 2011 | 11:17 PM

joeld

Racer

Joined: Sep 2007

Posts: 375

Likes: 18

From: Lawrenceville Georgia

I just bought some of the double studs for my 89 from the dealer. I'll check the numbers if I can find the package Sunday. Meanwhile, this will give you some info that's usually correct.

Joel

http://www.compnine.com/index.php?u=...00&grouptype=B

Sep 18, 2011 | 05:01 AM