Well the 455 is not stock. The motor has 550 horsepower bored 20 over with a roller cam. The engine builder told me to buy a ignition with a rev limiter and set it to 5500 rpm's. So should I go with a B cut impeller?
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In all honesty this is somewhat impossible to answer.
At what point (rpm wise) does it make the mentioned 550 hp? More importantly, how much torque does she develop at that RPM?
I would go with an A impeller, if you have the pump apart already, it is really easy to tell, that being said, your 550 HP is pretty much at the limits of an aluminum impeller anyway, you might consider picking up a mag bronze or stainless A, you may even be able to get away with a AA which is why it is somewhat critical to know what you will be doing with the boat and what you have for actual power.
There is an impeller cut chart here, that is the ONLY way to tell what you have, make sure and verify the wear ring clearances and bowl face to impeller shimming to ensure your pump is nice and tight before going through all the headaches of putting it all together...
Hope this helps you out.
GT
