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Oldsmobile Forum: Intake Manifold Gaskets 3.1L
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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?

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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 1 Week Ago
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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