91 intake manafold gaskets

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Jul 14, 2006 | 11:40 PM

rcr103

Thread Starter

Instructor

Joined: Jan 2005

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From: Ft.Worth Texas

91 intake manafold gaskets

I pulled the intake off my 91 vette to replace the gaskets.Please help here,The new gasket set came with rubber gaskets for the front and back valley .When I pulled the manifold it did not have these .Should I use the rubber gaskets and silicone,or should I just use hi temp silicone?
Thanks for any help,
Randall

Jul 15, 2006 | 12:01 AM

LS6 Motor

Drifting

Joined: Apr 2005

Posts: 1,283

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From: New York

I did my 91 this past winter, and I just used the sealant that came with the gaskets which were Felpro. It helps to let it set up for a day or two. How many miles are on the car?? You might want to consider a couple other things while you are in there such as hoses, water pump, etc.

Last edited by LS6 Motor; Jul 15, 2006 at 12:09 AM.

Jul 15, 2006 | 12:45 AM

rcr103

Thread Starter

Instructor

Joined: Jan 2005

Posts: 145

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From: Ft.Worth Texas

Has 65,000 miles ,replaceing thermastate,egr,injectors,all vacuum hoses,and tensioner pulley. the water pump looks and works ok,but maybe I should replace it too since I'm there.Just replaced the S belt.
Thanks,
Randall

Jul 15, 2006 | 01:02 AM

RRT vette

Le Mans Master

Joined: Feb 2006

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From: Louisiana

No don't use the S shaped gaskets for the front and back. Just use The Right Stuff sealant.

Jul 15, 2006 | 01:30 AM

zr1fred

Race Director

Joined: May 2006

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From: Phoenix Arizona

A quarter inch ribbon of rtv on the front and rear, with a little on the water jackets to both seal them and to hold them in place.

Last edited by zr1fred; Jul 15, 2006 at 01:35 AM.

Jul 15, 2006 | 01:35 AM

RRT vette

Le Mans Master

Joined: Feb 2006

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From: Louisiana

Just use 3/16" bead of the RTV sealant on the front and rear of the manifold mating surface and all should be good.

Jul 15, 2006 | 02:28 AM

SunCr

Le Mans Master

Joined: Dec 2000

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From: San Diego, Ca

As posted, forget the seals, but the '91 was designed for a unique intake gasket (used on ZZ4 and current production 113's). Heads are counterbored for gasket retainers which hold the gasket in place when you install the manifold. This was a redesign to stop the leaks that were so commonplace on everything that came before it. As far as I know, they're still available through your dealer or a GM Performance Parts Supplier like Scoggins Dickey or an aftermarket specialist like Street and Performance. You don't have to use them, but they're a nice bonus and I recommend you consider them because they keep the gaskets in place. If you do get them, make sure you specify they're for a Vette and not the F-Body or the ZZ4. Latter doesn't include the built in coolant restrictors which were used on the Vette.