QJet 1/4" insulator gasket needed? - Team Camaro Tech
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post #1 of 10 (permalink) Old May 20th, 15, 05:44 PM Thread Starter
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Joseph
 
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QJet 1/4" insulator gasket needed?

After having Quadrajet rebuilt, the carb guy gave me a 1/4" thick paper insulator gasket. Is this needed? I have the original cast iron intake with heat crossover plugged and I am doing the gasket, steel baffle, gasket set up recommended by Lars.

Where does it go if I do need it?
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post #2 of 10 (permalink) Old May 20th, 15, 06:03 PM
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Re: QJet 1/4" insulator gasket needed?

The carb kit probably came with an assortment of gaskets in it. Only use the gaskets you need to match your carb. I take it you have an original carb?

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post #3 of 10 (permalink) Old May 20th, 15, 06:05 PM Thread Starter
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Re: QJet 1/4" insulator gasket needed?

Quote:
Originally Posted by dyno jonn View Post
The carb kit probably came with an assortment of gaskets in it. Only use the gaskets you need to match your carb. I take it you have an original carb?
Yes original Quadrajet...thanks
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post #4 of 10 (permalink) Old May 20th, 15, 06:37 PM
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Re: QJet 1/4" insulator gasket needed?

The original service gaskets you cuold get at any auto parts store in the late 60's through the 80's were a single gasket sandwich of tinplate, and fiber gasket and are still out there but you have to hunt for them. The common service part these days is a single fiber gasket, and you can still find the tin heat shield plate gasket.

Most people with original unmodified hot-slot intake build a sandwich as described by lars. Fiber with slot, tin plate heat shield with no slot and then fiber with slot is the mix I use on my Q-Jets.


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post #5 of 10 (permalink) Old May 20th, 15, 07:03 PM
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Re: QJet 1/4" insulator gasket needed?

I had my Q-Jet rebuilt by Lars and he also recommended the 3 gasket sandwich that you and Brian mentioned with no additional spacer. I haven't had any issues at all with that setup. If you don't already have part numbers and pictures, here is a link to his write up in the Corvette Forum: http://www.corvetteforum.com/forums/...d-problem.html
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post #6 of 10 (permalink) Old May 20th, 15, 07:04 PM
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Re: QJet 1/4" insulator gasket needed?

Stuffing the heats slots with alluminum foil is non visible and then you can use the stock looking gasket. Stacking gaskets opens up the chance for leaks.

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post #7 of 10 (permalink) Old May 20th, 15, 09:02 PM Thread Starter
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Re: QJet 1/4" insulator gasket needed?

Thanks for the input guys.

I was just wondering if I needed to use that thick "insulator" in addition to the gasket/tin/gasket combo???
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post #8 of 10 (permalink) Old May 20th, 15, 09:58 PM
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Re: QJet 1/4" insulator gasket needed?

Quote:
Originally Posted by cam1967rsss View Post
Thanks for the input guys.

I was just wondering if I needed to use that thick "insulator" in addition to the gasket/tin/gasket combo???
No.

Jon N

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post #9 of 10 (permalink) Old May 20th, 15, 10:04 PM Thread Starter
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Re: QJet 1/4" insulator gasket needed?

Quote:
Originally Posted by dyno jonn View Post
No.
Copy that. Thank you...
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post #10 of 10 (permalink) Old May 20th, 15, 10:23 PM
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Wink Re: QJet 1/4" insulator gasket needed?

Quote:
Originally Posted by 1971ls6 View Post
Stuffing the heats slots with alluminum foil is non visible and then you can use the stock looking gasket. Stacking gaskets opens up the chance for leaks.
An even easier 'fix' for plugging the crossover channel under the carb in the intake is to install plugs in the holes on either side

I switched from using brass 'freeze' plugs to 1/4"NPT plugs about 10~15 years ago on restoration engines using stock intakes.

Here is the 'tap-n-plug' procedure:

Use a 1/4"NPT tap to create threads in the existing holes - Click image for larger version

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Install 1/4"NPY plugs using a good sealer, Like Permatex #2 - Click image for larger version

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You can also drive in brass plugs of the correct size to seal - Click image for larger version

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I've been plugging these crossovers since the 70's and never had any problems doing so.

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