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Prop Selectiion


I have a 1994 390 CPMY with 7.4 carb Big Blocks. The props are 22 x 22, and that is what is on the build sheet. I can hit 4000 rpm under ideal conditions, and it is not standouts, but has to build, and top speed of 29MPH. Not too shabby for a boat of this size. However, should I be hitting a higher rpm? I was wondering about maybe moving to a 22 x 21? GPH full throttle is approx 66 GPH. At 3200 I am kicking 42 GPH. Any input?

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