How to determine the hp, on a Mercruiser 5.7?
 

Lost In Space/Woodchuck wrote:
call around and see who has a prop shaft mounted dyno which should get the
true close HP. Pre 89 5.7's with 4bbl carbs were 260hp at the crank.

That's a good idea. There is a fairly reputable boat dealership about
thirty miles from me. And I'm going to ask them to do some "check-up"
on the boat this spring when I dig it out of mothball. They just might
have a dyno.

Thanks!