Crossover Pipe Gaskets

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gbodysupreme

Not-quite-so-new-guy
Jun 26, 2015
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Pittsburgh, PA
Trying to replace the crossover pipe gaskets on my 84 Cutlass Supreme, 307 vin Y. Walker shows a listing for one of the donut seals on the passenger side, but I think that is for the down pipe. I also had ordered a Fel-Pro engine gasket kit that came with some of the seals, but not the ones I needed. Any ideas?
 

ELCAM

Royal Smart Person
Jun 19, 2021
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That crossover pipe doesn't have seals or gaskets. Tapered pipe on tapered manifold you just have to tighten it so it aligns just right. Its a crappy design.
 
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gbodysupreme

Not-quite-so-new-guy
Jun 26, 2015
32
10
8
Pittsburgh, PA
There is a mating surface on the passenger side manifold, but there is just a flat machined surface on the drivers' side. Am I missing something?
 
Oct 14, 2008
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Melville,Saskatchewan
There is a mating surface on the passenger side manifold, but there is just a flat machined surface on the drivers' side. Am I missing something?
Take a pic. Some have the heat riser valve but it should still be there, valve or not.
 

ELCAM

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Jun 19, 2021
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EX MAN.jpg


That does have gasket to the manifold I think it is a Felpro 21719DC and is basically unavailable.
 
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69hurstolds

Geezer
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Jan 2, 2006
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Correct on no gasket needed for the crossover pipe flange on Olds 307 V8 with stock exh manifolds.

However, the gaskets for the exhaust manifolds are discontinued by GM, but you can get aftermarkets, or find NOS ones on the open market somewhere.

The donut gasket is for the down pipe to the cat. That's the one with the 3 bolt/spring flange on it. The EFE valve on driver side has a 2 bolt flange gasket between the manifold and EFE valve itself.

GM p/n 22526988, FELPRO 60771 or equivalent is the EFE to manifold gasket on the driver side.

GM p/n 1262500, Walker 31511, or Mahle F7207 is the donut gasket on the passenger side to the down pipe.
 
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