Hello. I have a 1990 Mariner 250 horsepower engine that greneded the #5 rod
and blew a big hole in the water passage of the block. The powerhead is
shot. I realized that the block is a Cosworth, made in England.
The dealer told me that any Mercury 225-250 powerhead will fit on my lower
unit (he didnt say what years, some help here would be appreciated), but
unless I get another Cosworth block, I will have to replace everything on
the powerhead (carbs, intake, etc...). I dont really want to have to do this
and would like to find a rebuilt Cosworth powerhead. Any insight anyone can
give me would be much appreciated.

Thanks
Chad