Quote Originally Posted by 76GMC1500
I see no reason why this setup couldn't spin the prop faster than the stock engine.

Pat, the Mercruisers are a combination of over hub and through hub exhaust
yes i know that i was a mercruisers wrench but now i see it was a omc i have put some flaper valves in them mercs and gimbal rings and housing now the pain is comming back thanks 76gmc