i remember years ago when L92s first came out there was a local setup. It was TSP 408 shortblock, had L92s on it and a Senergy cam in it for the L92s. Had a mail order and it only dyno'd 420 rwhp.
im sure some would blame the tune but a tuner can only work with what parts were used. could always pull those heads off toss on some TF 235s, a 24x,24x cam with fast 102 and be well over 500 rwhp
2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
2002 Silverado - 427Lsx w/ Twin gt4202s
2010 Silverado crewcab Z71 - 5.3litre w/ procharger
2000 Wrangler - 5.3litre with some stance
2014 Xsport- 3.5 Eco boost
412 Motorsports
it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference