454 bored .030 over domed Pistons, compression is 9.5-1, 781 heads comp xm flat tappet cam duel plane manifold with 750cfm dp carb. 18ft eliminator! Not looking to turn higher rpm, just looking to get a higher mph, just not sure if I would be better with a c cut or b cut, or a2, a3? Not sure which impeller would make the boat go faster
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IMHO, stick with an A.
Install a quality loader and if you don't have one, a Diverter.
Honestly the trick is in the set up of the hull and pump more than impeller cut.
As an example, unless you can gain 50hp by spinning the engine faster, the speed gains by an impeller cut all by itself will be nearly immeasurable.
Just reading about your set up and based on nothing but past experiences and numerous assumptions, it sounds like you have a worn pump with wide wear ring clearance. That being said, just a tighter impeller to wear ring gap and some freshening up and adjustments should net you another 3-5mph, pretty easily actually.
If you want that impeller kit let me know. I sent you a pm.
GT
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