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What are your HP goals? That will determine what you need. It won't hurt to have more pump than you need, but you want to use the smallest injectors you can get away with to keep them operating in the 80% duty cycle range.

19# injectors support around 300 hp at the crank, 42# injectors support around 560 crank hp.

Here are the calculators, plug in the numbers.

-mike
 
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