mercury 300x, 300xs, 250xs horsepower

[arne0072]

Hi all, I am new here and have a question about true horsepower ratings. I have searched the archives and haven't found much of an answer to my question....which is, what are the true horsepower ratings of these three engines: the 300x, the 300xs, and the 250xs. Does anyone know of any accurate dyno tests of these motors? I have read conflicting reports of the true (prop) H.P. ratings of these motors. Any info would be appreciated.
thanks.

[mikeylarge]

From my understanding, they all vary slightly.. some motors dyno a few more hp then others but
300x 320 + - hp
300xs 305 + -
250xs 275 + -