Carb mounting...studs or bolts??

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May 18, 2009 | 02:54 PM

MakoShark72

Thread Starter

Safety Car

Joined: Oct 2006

Posts: 3,993

Likes: 9

From: Gig Harbor WA

Carb mounting...studs or bolts??

Just wondering if bolts are OK or if I should install studs into the aluminum manifold and attach the carb with nuts??

Thanks!

May 18, 2009 | 03:00 PM

bashcraft

Le Mans Master

Joined: Jan 2006

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From: Butler Pa

Studs are easier, and if the carb will be removed and reinstalled often, bolts will wear out the threads in the manifold.

May 18, 2009 | 03:12 PM

MakoShark72

Thread Starter

Safety Car

Joined: Oct 2006

Posts: 3,993

Likes: 9

From: Gig Harbor WA

Quote:

Originally Posted by bashcraft

Studs are easier, and if the carb will be removed and reinstalled often, bolts will wear out the threads in the manifold.

Good point....thanks.

May 18, 2009 | 03:52 PM

toddalin

Le Mans Master

Joined: Oct 2000

Posts: 8,897

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From: Santa Ana CA

To do it "right," you have to use studs. Note that the thread into the manifold is different than the thread that holds the nut.

May 18, 2009 | 04:06 PM

Bronze76

Racer

Joined: Jun 2008

Posts: 269

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I like studs. If the threaded holes in the manifold are blind, then it's possible to use a bolt that is too long and bottoms out before the head clamps down on the carb flange. I've seen a lot of people with leaks at the base of the carb and they had to add several washers to get it sealed up. Doesn't look too professional in my opinion.

May 18, 2009 | 04:47 PM

rcread

Race Director

Joined: Aug 2004

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From: Duvall, WA

I just bought some threaded rod, some nuts and washers and made my own studs.

May 19, 2009 | 05:45 PM

Alan 71

Team Owner

Joined: Sep 2006

Posts: 31,287

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From: Westminster Maryland

I guess Chevrolet wasn't sure either... 71, 350/270, quadrajet, cast iron manifold.... 2 bolts and 2 studs!?!
Regards,
Alan

May 19, 2009 | 06:23 PM

Ganey

Race Director

Joined: Apr 1999

Posts: 11,520

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From: CORVETTE 77 385 C.I. TEXAS

Studs best as said.

Alan
A couple of bolts & studs are fine for Q-J.
Normally we just take it off once ...
J/K

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May 20, 2009 | 07:50 AM

bashcraft

Le Mans Master

Joined: Jan 2006

Posts: 6,506

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From: Butler Pa

Quote:

Originally Posted by Alan 71

I guess Chevrolet wasn't sure either... 71, 350/270, quadrajet, cast iron manifold.... 2 bolts and 2 studs!?!
Regards,
Alan

There's really nothing wrong with using bolts in an iron manifold, but if you must use bolts in an aluminum manifold, it would be best to have helicoils installed.