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Oldsmobile Forum: Intake Manifold Gaskets 3.1L
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  #1  
Old December 17th, 2017
stuhrling stuhrling is offline
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Intake Manifold Gaskets 3.1L

My neighbor has a 96 Olds Cutlass Supreme that has the usual leaking intake manifold gaskets problem. He was looking up replacement gaskets for this engine but found that there is a 1st design and a 2nd design for this. He cannot discern which is the proper version. Is there a way to tell this before pulling everything apart?



Thanks!
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Old January 2nd, 2018
Walter F Walter F is offline
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The difference lies in the push rod guides. I believe the 1996 3.1 does not require removal of the pushrods to replace the lower intake gaskets. Be sure to change the o ring on the oil pump drive while you're there and use plenty of silicone where the manifold meets the block.
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Old December 7th, 2018
woodyBR549 woodyBR549 is offline
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One way to tell which gaskets are required, at a glance. One being the number of bolts in the upper intake. If it has six bolts then the gasket for the lower intake must have offset locating pins over the center head port. If it has 12 bolts the gasket must have the locating pins "centered" over the center head port. Read the bulletin at www.fme-cat.com/Docs/1430.pdf
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Old December 29th, 2018
woodyBR549 woodyBR549 is offline
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The best gaskets to use are Fel-Pro MS98003T or MS98004T. Both are steel framed. Why put the "prone to fail again" plastic framed gaskets, like the ones you just removed, back in your engine? Take the time to get the right gasket set. Either will "look" like it fits, however putting the wrong gaskets in will cause both the lower and upper intakes to crack when torquing the bolts. You won't know the lower is cracked(breaks the tops off both center intake runners) where they meet the heads, that is until you start torquing the upper intake bolts and see and hear it crack. Been there, done it!
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Old May 1st, 2019
Synoptic 12 Synoptic 12 is offline
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I happened to notice this post. We had a 1997 Oldsmobile Cutlass Supreme as there was a recall for the manifold gasket. Look into this for the recall is open ended. Same motor as your.

* Dealership took care of the problem.
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