"Larry Kier" wrote in message
news:4IpVc.163993$gE.51748@pd7tw3no...
If it is a 351 it may be the merc 255 TR. Is it a four bbl or 2 bbl carb?
I'll have to check.

The 188 would be underpowered in a 2550.

That's what a local marine shop repairman said as well.

Thanks,
Matthew