C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

LT-1 Intake Gasket Replacement- Tips??

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Old Dec 18, 2005 | 09:11 AM
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Default LT-1 Intake Gasket Replacement- Tips??

I am planning to replace intake gaskets in my 96 soon due to oil leaks and any tips or suggestions from members who have done theirs would be appreciated. Perhaps you discovered something about the job that you would like to have known about beforehand that you could pass along. About how long did it take you? Any special tools needed?

Thanks, Greg
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Old Dec 18, 2005 | 10:09 AM
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C4 Guru will have an LT1 Intake tech tip ready tomorrow - it will have pictures.

There are a few special tools required.
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Old Dec 18, 2005 | 10:30 AM
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take pictures and make sure you route the vacuum lines correctly. Use a good RTV sealant at the front and rear of the intake.While the intake is off, use oven cleaner to give it a good cleaning. It's actually not that hard.
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Old Dec 18, 2005 | 02:06 PM
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Unlike the L98, the LT1 is really no harder than a carbureted SBC manifold. Use the Permatex gray silicone or better yet, The Right Stuff on the ends.
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Old Nov 7, 2012 | 03:16 PM
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To take the intake off I know its necessary to drain the anti-freeze but should I also purge the fuel system the same way you would need to do when replacing the fuel filter?
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Old Nov 7, 2012 | 03:32 PM
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The LTX intake manifolds are "dry" manifolds. There is no antifreeze running through them.

The Throttle Body has a coolant line. Some folks have removed them. If yours still has that hose attached, there is very little coolant there when you disconnect the line.

As far as the fuel system, you can release the pressure at the schrader valve at the rear of the manifold. You can also loosen the gas cap.
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Old Nov 7, 2012 | 04:13 PM
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Even though this thread is 7 years old...


Loosening the gas cap will in no way, relieve fuel system pressure. The schrader valve is the place to do that as was suggested.
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Old Nov 7, 2012 | 04:28 PM
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Whenever I am working on a fuel system, I usually loosen the gas cap. In this way, if I disconnect a line and/or raise the vehicle, I do not have to worry about fuel leaking.

Did not mean to confuse anyone.
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Old Nov 7, 2012 | 06:32 PM
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Default Fuel Purge when working on Intake manifold

I was thinking of pulling the fuse for the fuel pump and turning the engine over to purge rather than messing the shrader valve where ever that is?
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Old Nov 7, 2012 | 06:37 PM
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Buy the fel pro gasket set and it comes with silicone. Clean everything well and use a razor blade and brake cleaner. I put a thin smear of silicone on the front and rear areas on the bottom of the intake as well as a thick bead on the block. Mine stuck nicely. Whomever did mine the last time got zero adhesion.

I pulled the furl rails and injectors together then folder them over the radiator tank/pass tire area. I never let the pressure off
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Old Nov 7, 2012 | 06:52 PM
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Originally Posted by rappini
I was thinking of pulling the fuse for the fuel pump and turning the engine over to purge rather than messing the shrader valve where ever that is?
The schrader valve is located at the rear of your engine. Is basically a tire valve stem fitting with a black plastic cap. Put a small rag underneath and push in the center of the valve stem with a small screwdriver. Whatever pressure is in the fuel lines will squirt out.

Or as suggested above, just lay the whole fuel rail over on its side. Put something underneath the rail (cardboard or pan) so nothing is scratched.
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Old Nov 7, 2012 | 08:27 PM
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Originally Posted by Tom400CFI
Even though this thread is 7 years old...

Doh!

I didn't see that on my phone
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Old Nov 8, 2012 | 01:39 PM
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Originally Posted by rappini
I was thinking of pulling the fuse for the fuel pump and turning the engine over to purge rather than messing the shrader valve where ever that is?
Just disconnect the battery and be safe... and yes loosen the Gas cap or you will be surprised at the siphon action.. I used Permatex Ultra Grey on the front and back "China walls", very simular to both the right stuff, and Honda Bond.. all very good sealers, and sensor safe.

Not sure if you can get around the Steam pipe without removing completely, be really carefull if you decide to bend it..

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Old Nov 8, 2012 | 01:41 PM
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Originally Posted by bassackwards
Doh!

I didn't see that on my phone
New post (Rappini) yesterday!! he should have started a new post..
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