Olds 350-455 exhaust manifolds.

[nes-cv23]

I could use some new exhaust manifolds for my jets, but I?m only finding 455 manifolds,  I thought olds used the same manifolds for both, but I?m not sure.. anyone out there know the diff?     I know chev and fords use different ones for there big blocks and small blocks.

[carlsoncvx18]

I am thinking the 350 & 455 take the same exhaust manifolds.

[Hyperacme]

GLM ..
https://www.glmmarine.com/product-manifolds.html

CP Performance ..
https://www.cpperformance.com/

[thedeuceman]

Although they are similar design in that the center two ports are Siamese, they are different.


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[ccv-19]

 Never seen Marine manifolds just for 350 Olds.
 The ones I have seen are listed 350-455
 455 gaskets and heads are not all the same.
 The Marine manifolds use the larger port gaskets.
I like the Remflex ones they work great on  surfaces
that are not perfect.

[ccv-19]

 The smaller port gasket might work better on a 350 head.

[nes-cv23]

Yes. That is the difference on exhaust.   Same manifolds, diff gasket. Now I just need to find a bell housing. Same problem, all I?m finding is for 455. But I think there the same also. I need to find a Oldsmobile man who can give me the advice I need.    Anyone?

[ccv-19]

 
       Same bell housing . The engine block on the 350 is a little shorter than the 455