Does anybody know who makes these and if they will work with a mercruiser y pipe setup. Im thinking about buying these.

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My guess is those risers are not oem with those mans, looks like an aftermarket set of risers, I had some on my old 454 engine that looked just like those..they appear to be from a sbc.

The risers almost look like the ones IMCO use to make.

the risers do look similar to imcos. I would definitly figure out the brand so you can get riser gaskets if they possibly now or start leaking down the road.

Kodiak?

my biggest concern is if the length of the riser. Will I be able to put elbow on the end and exit through the out drive. Or will these manifolds not work for that application.