Need a little Upper Intake advice. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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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 07-26-2004, 07:35 PM   #11
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-oops, sorry I forgot to mention, that you will have to scroll over to the far right of the over-sized picture to see the old gasket. (the one on the left is the Fel-Pro replacement, and the one in the middle is the new GM replacement.)
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Old 07-26-2004, 08:48 PM   #12
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Originally Posted by 57chevythunder
Just re-torque the bolts? Here is link that shows the condition of my gaskets. Now you really have me wondering if maybe it could be possible that inadequate squeeze on the gaskets could have started the whole process of deterioration. Hmmm,,, maybe. However, as you can see from the picture how bad my gaskets were, they were definitely way beyond just re-torqueing.

As for me, whenever I have a Series II down for plenum replacement, I'm DARN SURE going to go that easy next step further, and replace the lower gaskets as well.

-then, maybe re-checking the torque a few months down the road would be a good idea?? Heck, I don't know. I do know that you can't get to all the bolts on the manifold, without having the plenum off, and I'd be a little spooked about tightening some, and not the others. (-I think that would really be inviting trouble)
My lower gaskets were even worse than that!! I think it might have to do with the fact that my wife only drives one mile to work; causing the car to constantly get started and shut off. The gaskets (and all material for that matter) expands and contracts more frequently with the short trips. Given that your mileage is so slow, I am assuming you do a lot of short-trip driving. Even if your gaskets aren't as bad as the ones pictured, changing them will give you piece of mind and let you go another 75K worry free.
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Old 07-27-2004, 09:08 AM   #13
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Default gasket

Yes the wife does short trips 2-4 miles and works a couple blocks away.
Looking at the gasket pictures I can see the failure near the center bank.
The middle GM gasket looks like they beefed up the amount of silicone in it.
Gmpartsdirect lists it for $30. Maybe I'll go with it.
The re-torquing I was referring to was a post on the BC where the upper plenum was removed already and the lower intake was found to have loose bolts especially the hidden ones on the ends. They just re-torqued them. I think it was in one of the top stickys.
Was all set to do the job this week but forgot I have to report to Jury duty
on Thurs. and will be out of town on the weekend. Rain today.
Gives me time to look for a lower gasket.
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