recently I switched my oem prop to a brass one i found, because i was having trouble pulling a skier, this new one works great, but someone told me not to run a brass one on a selectric shift. So I need to find a new prop, i dont know the size or pitch. I have a 16 1/2 ft fiberglass boat it would run about 30 now only 26 mph. If anyone has any ideas e mail me. Thanx