92 aluminum upper intake gaskets - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-30-2004, 01:25 AM   #1
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Default 92 aluminum upper intake gaskets

I pulled the upper intake on a 92 with the aluminum upper and didn't see a gasket. It looked as if were sealed with Indian head sealer???? I thought about getting a gasket but then what about the two o-rings in the front? the gasket will lift the intake and the o-rings may not seal. I looked through the posts and didn't see anything about it. The engine is about ready to go back into the car and want to do what I can with it on the ground.
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Old 06-30-2004, 02:14 AM   #2
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You found an aluminunm 92 upper? Sweet. Know where to get another?

If it'* like the 93 plastic (which I assume it would be), you're supposed to use a chemical to get the old sealer off, then apply a 1/16 inch bead of Loctite Instant Gasket Eliminator GM P/N 1052942 or equivalent to lower manifold mating surface. Make sure to circle all bolts. Tighten upper manifold bolts to 30 N*m (22 lb. ft.)

I'd bet the torque is different because of the material differences. And my book makes no mention of O-rings for the coolant passages.
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Old 06-30-2004, 09:14 AM   #3
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Thanks that helps.
This was the first aluminum intake That I have see on the 3800s Was glad to see that it wasn't plastic myself.
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Old 06-30-2004, 07:35 PM   #4
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Please note there are no EGR passages, therefore it won't work on any other 3800'* other than the 1991/92 L27, without some modifications (or should I call it a complete elimination) to the egr system on the 1993-1995 L27'*. Also, the TB opening is smaller. Might be some other difference'*, but these are two things that Allmachtige and I came up with when we were considering swapping 1991/92 aliminum upper intakes onto our 1994 L27'*.
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Old 06-30-2004, 07:55 PM   #5
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Who needs EGR? You could always port match the upper to the TB.
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