CDEVIL2:
I HAVE A 2003 21 COBRA 350 MAG THRU HALL EXHAUST.IT CAME WITH A 3 BLADE S.S. 48-13702 WITH 21-P.WHAT SHOULD I RUN TO GET MORE SPEED. What drive are you running? Bravo 1?
1)Find out what RPM at WOT (Wide Open Throttle) your engine mfgr recommends.
2) What RPM at WOT are you running?
A Larger number in Pitch = more Top End but sacrifices your hole shot and low end power. You want to work within the limits of your recommended RPM...
I have an Essex Sterling 21' with a 350 MAg Bravo III and run a 3 Blade 26 Pitch and run mid 60's.