I have a 29 ft fountain with twin blowen 454's that Dyno 536 hp at 5300 rpm. the boat is spinning a 27marige at 5300 and gps's 83mph. this is a hand full to drive and would like to run 4 blades and dont know what to buy. has any one been here before and can give good advice?

You might want to get in touch with BRS over on the Fountain board, he has the same set up as you making similar power

I would say 28-30 bravo 1s

Jeez, I don't know. I'm just trying to catch up with Waterfooul and Audiofn on posts. Besides, I'm an inboard cruiser guy, and everyone knows that we don't know dick about outdrive stuff.