Oil Leak - Intake Gaskets
Thread Starter
8th Gear
Joined: Feb 2004
Posts: 8
Likes: 0
From: St. Charles MO
Oil Leak - Intake Gaskets
Hi, I just purchased a '96 with the LT4 engine. I believe the intake is leaking front and rear and plan on replacing the gaskets myself. I'm looking for feedback to ensure success. Other than not starting the car for 24 hours after installing the new gaskets and using the GM sealant, any other suggestions? Anything I should replace while I have it apart? Note: I'm planning on buying the gaskets from GM.
Pro
Joined: Nov 2002
Posts: 513
Likes: 0
From: Maple Grove MN
Re: Oil Leak - Intake Gaskets (KWP)
I would recommend the GMPP gaskets, they fit the LT4 better. Not sure of the part number but it ends with 77. Be sure you get the mating surfaces extremely clean to avoid future leaks. Torque using the recommended sequence, increasing the torque gradually with each pass. I used The Right Stuff RTV based on recommendations from this forum and I would recommend it as well. Good luck, take your time and if you do some searches on the forum there are a bunch of threads with details.
Burning Brakes
Joined: Nov 2001
Posts: 1,241
Likes: 9
From: Houston TX
Re: Oil Leak - Intake Gaskets (KWP)
from the GMPP catalog, the special tall port LT4 intake gaskets are #12367777. these are only one per part number, and they're expensive. they're the only gasket that doesn't block the top of the port. (even the production LT4 gasket blocks the top.)
i see this leak thing as being pretty common. did GM do something wrong at the factory?
-michael
i see this leak thing as being pretty common. did GM do something wrong at the factory?
-michael
Race Director
Joined: Feb 2003
Posts: 11,672
Likes: 20
From: Lake Wylie SC
Re: Oil Leak - Intake Gaskets (KWP)
The sealant I'm going to use is GM # 12346141 It's assembly adhesive especially developed for engine oil joints. I have a LT1 and have to do the same thing. I'm using GM's intake gasket set. Is this going to block any of the ports?
Burning Brakes
Joined: Nov 2001
Posts: 1,241
Likes: 9
From: Houston TX
Re: Oil Leak - Intake Gaskets (GlockLT4)
12367777 gaskets won't do you any good. You have to port match the intake to it.
-michael
Team Owner
Joined: Apr 2001
Posts: 22,267
Likes: 3
From: Dallas TX
Re: Oil Leak - Intake Gaskets (MSR)
12367777 gaskets won't do you any good. You have to port match the intake to it.
hmmm... i didn't think about the intake manifold. i remember for sure that my stock heads had ports taller than the stock gaskets. is the stock intake as short as the gasket? (i had a port-matched intake.)
-michael
hmmm... i didn't think about the intake manifold. i remember for sure that my stock heads had ports taller than the stock gaskets. is the stock intake as short as the gasket? (i had a port-matched intake.)
-michael
Le Mans Master
Joined: Jan 2003
Posts: 5,858
Likes: 7
From: Santa Maria CA
Re: Oil Leak - Intake Gaskets (GS919)
I used The Right Stuff RTV based on recommendations from this forum and I would recommend it as well.
Permatex "The Right Stuff" works awesome. I used this when I began to leak oil from the front and back of the intake. This stuff seals very well. I have since used it on the front, back, and corners of my oil pan gasket as well. A little pricie at about $11 a can, but worth it. This stuff is the s*%#t. :thumbs:
[Modified by 86PACER, 12:51 AM 2/17/2004]
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Verdad Gallardo
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Re: Oil Leak - Intake Gaskets (MSR)
12367777 gaskets won't do you any good. You have to port match the intake to it.
hmmm... i didn't think about the intake manifold. i remember for sure that my stock heads had ports taller than the stock gaskets. is the stock intake as short as the gasket? (i had a port-matched intake.)
-michael
hmmm... i didn't think about the intake manifold. i remember for sure that my stock heads had ports taller than the stock gaskets. is the stock intake as short as the gasket? (i had a port-matched intake.)
-michael
Here's a shot of the ports on the heads matched to the gasket. Although not nearly as much as the intake, material was removed from the heads as well...
