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Discussion Starter #1
I am installing a 350 to replace my busted 305 and am upgrading the center riser exhaust to 4" risers.

Has anyone done this? The manifolds and risers are a simple bolt up, but I'm wondering about changes in ty-in to the down pipe. The 4" only come in a 7 degree as opposed to the 15 degrees on the 3" risers.

I won't have the engine in the boat until late next month, but would like to have everything I need ready to get it buttoned up.
 

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There is a 45 to go in there. First you will have about a 5" long hose then the 45 the it will tie into your Y. May not be a 45 but it's close.
 

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Discussion Starter #3
Thanks. I think(have to look again) mine are 90's and had the 4" to 3" rubber. I will be picking up 4" straight hose but am not sure if there may be a slight mis-alignment from the degree change.

If needed, I may be able to slightly raise the elbows to correct.
 
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