I am in need of some helpful advice! Owner of a 21ft day cruiser and currently on my second rebuild. I am on a quest for higher rpm's, approximately 1000 more. Boat seems to reach around 4500 max rpm's, but what now?
Engine set up:
Sleeved, Bored .30 over
Stock crank and rods
Edelbrock carb 750 cfm
Edelbrock Performer RPM Aluminum Heads 75cc
Edelbrock Performer Aluminum intake manifold
Trick Flow Roller Rockers
Comp Roller Cam, Roller Lifters, Pushrods
Berkley 12JC, Aluminum A impellar
Hydraulic Place Diverter
I know the added length and weight being a day cruiser limits my power. Should i concentrate on my jet? Add a snoot,shoe, different impeller??? I really would like to surpass 5000rpms. Any suggestions would be appreciated.