Swap to LS6 - loctite needed?
Safety Car
Joined: Apr 2000
Posts: 4,326
Likes: 140
From: Weatherford, TX
Looked it up for ya.
Apply threadlock GM U.S. P/N 12345382, Canada P/N 10953489, or equivalent to the threads of the intake manifold bolts (1).
Install the fuel rail stop bracket (2).
Install the intake manifold bolts (1).
Tighten the intake manifold bolts a first pass in sequence to 5 N·m (44 lb in).
Tighten the intake manifold bolts a final pass in sequence to 10 N·m (89 lb in).
Apply threadlock GM U.S. P/N 12345382, Canada P/N 10953489, or equivalent to the threads of the intake manifold bolts (1).
Install the fuel rail stop bracket (2).
Install the intake manifold bolts (1).
Tighten the intake manifold bolts a first pass in sequence to 5 N·m (44 lb in).
Tighten the intake manifold bolts a final pass in sequence to 10 N·m (89 lb in).
Last edited by Chris Stewart; Dec 26, 2009 at 07:35 PM. Reason: added pic
Thread Starter
Drifting
Joined: Aug 2007
Posts: 1,495
Likes: 0
From: Homer Glen IL
Looked it up for ya.
Apply threadlock GM U.S. P/N 12345382, Canada P/N 10953489, or equivalent to the threads of the intake manifold bolts (1).
Install the fuel rail stop bracket (2).
Install the intake manifold bolts (1).
Tighten the intake manifold bolts a first pass in sequence to 5 N·m (44 lb in).
Tighten the intake manifold bolts a final pass in sequence to 10 N·m (89 lb in).
Apply threadlock GM U.S. P/N 12345382, Canada P/N 10953489, or equivalent to the threads of the intake manifold bolts (1).
Install the fuel rail stop bracket (2).
Install the intake manifold bolts (1).
Tighten the intake manifold bolts a first pass in sequence to 5 N·m (44 lb in).
Tighten the intake manifold bolts a final pass in sequence to 10 N·m (89 lb in).
Thread Starter
Drifting
Joined: Aug 2007
Posts: 1,495
Likes: 0
From: Homer Glen IL
According to what I have been reading in the forum most installers don't use any loctite/permatex. I am confused...
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Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
There is another thread running with the same question. I have had my intake off a number of times. At first I used the GM procedure and the specified thread locker. However, after a while it became a pain because to properly apply each removal all parts must be cleaned for the Loctite to work. Now I install without it and have not had any issues. The Loctite will also seal the threads and the bolts go into the motor internals so there is oil vapor/oil in proximity to the bolt so there could be some seepage without using Loctite.
I also use my own tightening sequence with the FAST that differs from GM to make sure the intake is slowly brought into contact with the heads and is even. The FAST is much more flexible hence my modified procedure. This procedure takes much longer and the issue I found with the Loctite is that because it is anaerobic it was setting up on me before the manifold was tight.
I also use my own tightening sequence with the FAST that differs from GM to make sure the intake is slowly brought into contact with the heads and is even. The FAST is much more flexible hence my modified procedure. This procedure takes much longer and the issue I found with the Loctite is that because it is anaerobic it was setting up on me before the manifold was tight.
Last edited by vettenuts; Dec 28, 2009 at 08:09 AM.
Safety Car
Joined: Sep 2003
Posts: 3,558
Likes: 2
From: Cape Coral FL
The Blue Loctite is only rated to 195 degrees F not C so the Permatex is the better product as far as heat is concerned. I used the Blue Loctite at first and it broke down, i.e. turned brown and the consistency of sand.
Yes, as vettenuts has stated if you use it, you have to make sure you clean all surfaces thoroughly before you reinstall. And I agree that due to the mounting holes being blind the potential for buildup, especially at the bottom of the holes is greater if you use it rather than not.
Yes, as vettenuts has stated if you use it, you have to make sure you clean all surfaces thoroughly before you reinstall. And I agree that due to the mounting holes being blind the potential for buildup, especially at the bottom of the holes is greater if you use it rather than not.
Thread Starter
Drifting
Joined: Aug 2007
Posts: 1,495
Likes: 0
From: Homer Glen IL
The Blue Loctite is only rated to 195 degrees F not C so the Permatex is the better product as far as heat is concerned. I used the Blue Loctite at first and it broke down, i.e. turned brown and the consistency of sand.
Yes, as vettenuts has stated if you use it, you have to make sure you clean all surfaces thoroughly before you reinstall. And I agree that due to the mounting holes being blind the potential for buildup, especially at the bottom of the holes is greater if you use it rather than not.
Yes, as vettenuts has stated if you use it, you have to make sure you clean all surfaces thoroughly before you reinstall. And I agree that due to the mounting holes being blind the potential for buildup, especially at the bottom of the holes is greater if you use it rather than not.
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,171
From: Dyer, IN
You just gotta love this forum sometimes...some poor guy just trying to do the job right, and in this circumstance....following the service manual will ensure that end. You would think there would be some sort of agreement, but instead........disparity.....Just f$&king comical sometimes.........
Rock on
Rock on
Thread Starter
Drifting
Joined: Aug 2007
Posts: 1,495
Likes: 0
From: Homer Glen IL
You just gotta love this forum sometimes...some poor guy just trying to do the job right, and in this circumstance....following the service manual will ensure that end. You would think there would be some sort of agreement, but instead........disparity.....Just f$&king comical sometimes.........
Rock on
Rock on
Simple $8 plug chaser solved the problem in 15 minutes. What would have happenend if I took it to a random mechanic? Probably somewhere between $50 and $500 for a repair. I would have accepted either without the advice and painful experiences of my Corvette brothers.
Maintaining a corvette is like trying to have a good marriage (IMHO)...luck, hard work, and listening to those who have been there. That advice has gotten me this far.
Last edited by futuretech; Dec 28, 2009 at 04:23 PM.
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,171
From: Dyer, IN
