I am wondering if an aftermarket automotive flywheel like Zoom 50-6525 , $88 at summitracing will
work as a replacement for a genuine Mercuiser 168t 1-piece crank flywheel.

Need a new flywheeI for a 383 build and not sure if a six bolt Bravo coupler will fit to the thread holes
in these replacement flywheels.

Has anyone already tried that?

I have not tried it but, as long as the tooth count and the weight are the same, it will work.

I used one on a 350 one piece with no issue

but 383 are mostly ext balance engines. diff flywheel balance from neutral balance 350. i am sure summit offers 383 flywheel, and it will work. coupler bolts on to flywheel where clutch pressure plate mounts.

You might want to figure out whether or not your motor is internal or external balance before you buy anything.

The rotating assembly is Scat 1-91250BIE so the external balanced 350 flywheel and a neutral balancer should be ok.

Scat will do the balancing job so I hope they got the right flywheel from me.

i think all the 350s are internal balance but im not sure.

just asking to follow along, are you referring to marine OEM stock 350's as they are external balance or the scat cranks being balanced for the 350's ? .

ok i just did a little research,350 was internally balanced until 1985 then they went to the one peice rear main seal,they are externally balanced with a weight in the flywheel/flexplate, the harmonic balancer on the crank snout is the same..

Ok I thought you were referring to the 350 itself but was confused so that's why I posted a marine OEM stock 350 being external balance in my question to you. Yep been that way externally balanced for a very very long time. If I recall it was before 1985 for the Marine OEM's I can look it up as well thru Merc or OMC or Volvo.