I've got an '88 Ski Supreme(Supreme now) 20ft open bow. It has an Indmar 351 With a Holley 600 Marine on top. Boat and motor have 1173hrs. The heads/gaskets/plugs/carb are all NEW 2yrs ago. Anyhow, the current 4-blade won't spin past 3500rpms when the boat is loaded up(2k-2300lbs of people, gear, and ballast), and the 3-blade doesn't hold speed as well when I cut. Anybody have experience or suggestions?
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