Found this on LS1tech, sorry if its a repost
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specs:
4L80E with shift kit
6.5L turbo diesel engine, newer 506 block, newer heads about 60k on a rebuild
Cummins HX-35W turbocharger rear mounted, 40 mm External Wastegate, 3-4 psi cruise, 8-12 half throttle, WOT...