40#'s will support 520 HP
42#'s will support 550 HP
50#'s will support 620 HP
Above is at the flywheel not rear wheel hp. and using 43 #'s of fuel pressure using .5 BSFC (Brake specific fuel consumption) and 80% max duty cycle.
As with all fuel injectors you can raise their fuel rate by raising the fuel pressure. 42's @ 43PSI will become 45.3's @ 50PSI and so on.
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