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  1. W

    305 down on power (a little long)

    ok guys, here's the deal- My boat is an '80 glastron cvx18 with a mercruiser 228 (305 chevy 4bbl). When i bought the boat about 3 years ago, it would run around 4800 rpm w/ a 21 pitch going about 55-60 mph. at some point it lost power and i am now down to 4500 rpm w/ a 19 pitch going about...
  2. W

    downpitched prop with no increase in rpm?

    on my '80 18' glastron carlson with a 228 mercruiser sterndrive (305 chevy 4 barrel) i used to be able to turn 4600-4800 with a stainless 21 pitch. the 21 got damaged and I used a 23 for awhile and the rpm dropped to around 4200-4300. about a month ago I bought a 21 pitch prop same brand...
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