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I dont know much about the LS4/5.3L, but the hp to the wheels may seem low because of where he got it dyno'd or tuned. And although the LS6 heads flow better, the chambers are larger than the 5.3 heads...less compression.
He should see gains, but dont expect the same type of gains as you would from an ls1 with ls6 heads and cam.
LS4 is a fancy way of saying truck motor.
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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