Hi
I am currently running my 1989 searay amberjack with 2002 4.3 merc. apox 180 hours, 190 hp at the prop, alpha one drives. with out of the box 14.5 X 18 merc 4 blades R and L. I have cupped the props trying to bring down my cruising rpm of 3800 at 24 mph, I dont need speed I would like to run...
