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From what I've read, the VRFPR will give a higher fuel pressure at max than any of the adjustable FPR so that's why it works better. Sounds like you guys it had it hooked up to the wrong vacuum source. But another restriction could be his fuel line. The factory fuel line is pretty small and can restrict the hp potential in the 450 hp + range which sounds about where he is.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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