2550 Bayliner

true - but then it would be underpowered unless he buys a D4, unlikely in a 2550.
I suppose that little astra van mercruiser whatever that was called might do the job and fit.
 
I have done this with a 2450. Not as wide or as long but I swapped a 5.0ltr v8 230hp for a 4cyl Volvo Kad32 170hp and can still make 30 knots.You will need a few more HP but if the engine bay is the same length, will not be able to fit a 6 cylinder. Yanmar used to make a 4 cylinder 240 hp motor which would probably do.
 

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