any GM gurus?

[Which 450?]

I bought a 1990 merc 140 for my boat, it has a single piece rear main, old one was 2 piece, its a smaller bolt pattern. 3" center to center across the middle. I cannot find a flywheel for the life of me.

I need to know what GM vehicle(s) used a 153 tooth flywheel, single piece rear main, internally balanced, and 3" center to center across the middle (I think this was the same with all single rear mains?) I see them on ebay, but I have no idea what car or truck they came out of!

[RideRed84]

Is that the 3.0 inline 4?

[Which 450?]

yes

[RideRed84]

I know that the engine never came in a GM vehicle. It was used as an industrial engine in tractors and generators. You probably won't find that flywheel in any car. Hope that helps.

[TRX450RACER174]

Is this what your looking for any Mercruiser dealer should be able to get it.
http://www.marineparts.com/sierra/sierra592.aspx

[Which 450?]

actually the 3.0, destroked and debored is the same 2.5 they used in certain year novas that I dont know. and I think i actually found one on ebay, the problem was finding one thats for an internally balanced motor. The one I found is an aftermarket flywheel with removable weights.