I HAVE A 305 MERCRUSIER. WITH A 898 LOWER. AT FULL THROTLE MY BOAT RUNS AT 5400 RPM. MY FACTORY MANUAL SAYS THAT 4600 RPM IS THE MAX RPM TO RUN. I HAVE A 19 PITCH PROP ON THERE NOW WHAT PITCH WOULD BRING THAT DOWN,BUT STILL ENOGH TO PULL A SKIER WITH A FULL BOAT? THANX:confused: