i have 88 sunbird with a 4.3 v-6 ,it,s a 20ft. cuddy the prop. thats on it is a stainless 14.25x19 my rpm,s seem to be about 3600 to 3800 at full trottle at 37 mph.that does not seem to be right ,what is that motor rated at for max. rpm,s.<br /> thanks <br /> bob