The other three things that may contribute to higher horsepower are the cam,
compression ratio and valve size. You should check out those things before
you go to the trouble changing the carb.
LD
"crystalguy" wrote in message
oups.com...
I recently purchased a 1988 Sea Ray with a Mercruiser V-6 4.3 with a 2
barrel carb (175 hp)
Is it possible to convert this to a 4.3 with 4 barrel carb (205hp)
Is it just a matter of changing the carb and intake or are the
ingnitions different?

Any input would be greatly appreciated.