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what size injector would i need i have 42#hr now do i need to go up or is this cool to reach 300whp i will be building the motor
 

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i would think 300 would be maxing out those injectors, prolly 50's would be more safe.

You might be ok tho, try it out. I'm still on stock injectors running a little over 200whp.
 

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42s won't handle that PSI and power level. Get some 60s.
 
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