Gasket failure...but which one? - 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 05-15-2005, 03:36 PM   #11
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Originally Posted by Lime
Wow, thanks guys.

Bill: When you say 800-1700 for GM'* "fix", is that at a dealer or shop? I'll be doing this myself, would it be the $150 for the upper plus gasket, and then $40 for the lower gasket, if that indeed went as well? When it hydrolocked, i couldn't even crank it over with the starter, so at the worst, maybe the starter is gone. If I went the GM way, the car already has ~170k+ on it, so 40k-60k miles would be peach.

bob: you have a sleeved upper intake manifold? Could you show me what a sleeved upper looks like? thanks.
At a GM dealership expect to pay $800 for a new upper and lower gasket change. The $1700 comes when the lower aluminum intake manifold needs to be changed at the dealer too. This can happen if the aluminum around the coolant passages gets so badly pitted that a good seal can no longer be obtained. Sometimes GM will sell you a "revised" Series II lower intake manifold for several hundred dollars to provide you with a reduced diameter EGR stovepipe that you can buy and install yourself for $20! Plus- GM and most shops won't sleeve your upper to keep it from failing in the future.

Please read and see pictures of a sleeved upper at the first thread referenced.
It will answer a lot of your questions. Don't even think of changing out the upper only. After you have gone to the trouble of tearing it down that far, unless the lower intake manifold gasket has been recently changed, you really must change it for a new one. I don't know what the ratio is, but from what I have read on this site, it seems like maybe half the failures are a bad upper, and half are bad lower gaskets.

If you install a sleeved upper, a reduced diameter pipe, and the new generation lower gasket, the chances are very good you will never have to do the work again on that engine.

It is good news if you didn't even hear the engine "cough" when you tried to start it. Hopefully, your rods will be OK.

1995 SLE
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