Quadrajet gasket question?? - Team Camaro Tech
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post #1 of 8 (permalink) Old Mar 18th, 10, 01:11 PM Thread Starter
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Brian
 
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Quadrajet gasket question??

I just replaced my manifold with a performer one from edelbrock. When i put the carb back in, it had a metal plate/gasket along with the traditional gasket. Do i use both?
Does the metal/heat shield go between the manifold and gasket or between the gasket and carb?
Do i need this heat shield?(what i think it is)
Any silcone advised?
Help if you can would be appreciated
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post #2 of 8 (permalink) Old Mar 18th, 10, 01:57 PM
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Re: Quadrajet gasket question??

Yes, manifold, metal gasket, regular gasket, and carb.

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post #3 of 8 (permalink) Old Mar 18th, 10, 02:03 PM
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Wink Re: Quadrajet gasket question??

Quote:
Originally Posted by brianstevens03 View Post
... Do i need this heat shield?(what i think it is) ...

Help if you can would be appreciated
You don't really 'need' the plate since you replaced the stock intake (which has a cross-over with exhaust flow to warm carb that is sealed by the plate) with the Performer - but it won't hurt ...

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post #4 of 8 (permalink) Old Mar 18th, 10, 02:23 PM
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Re: Quadrajet gasket question??

Right, it's not needed and I always thought it increases the chance of a vacuum leak with that stack of gaskets.

Use the 1/4" thick newer base gasket without the shield.

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post #5 of 8 (permalink) Old Mar 19th, 10, 04:22 PM
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Re: Quadrajet gasket question??

Doesn't the Performer have the crossover provision? If so, I'd still use the thin stainless heat shield to help keep the carb and fuel cooler.
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post #6 of 8 (permalink) Old Mar 19th, 10, 04:37 PM
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Wink Re: Quadrajet gasket question??

The original GM manifolds had an open crossover 'chanel', that ran directly under the front of the carb. These would leak exhaust gases into the intake if the gasket was defective or the metal plate was left out during service work. These required a metal material so it would not burn thru from the hot exhaust gases like a regular gasket would.
The 'Performer' has an internal, sub-plenum crossover system that is totally sealed to the intake and runner circuit. So they don't really need this metal gasket.

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post #7 of 8 (permalink) Old Mar 19th, 10, 04:40 PM
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Re: Quadrajet gasket question??

John's right. That open slot or groove around the front of the carb in a factory manifold, that is open to exhaust.





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post #8 of 8 (permalink) Old Mar 21st, 10, 09:38 AM
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Re: Quadrajet gasket question??

Quote:
Originally Posted by ZZ430DropTop67RS View Post
Right, it's not needed and I always thought it increases the chance of a vacuum leak with that stack of gaskets.

Use the 1/4" thick newer base gasket without the shield.
what this guy said- go to the parts store and get one of the thick stock replacement gaskets for a 70's/80's car or truck. if you get a decent one, it will have torque limiting plastic inserts in the bolt holes to keep you from overtightening the carb.

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