The LS6 crank is no different than any other LS crank that has the same stroke. All LS cranks have two positions for the pilot bearing. The f-body position is deeper inside the crank and uses a pilot bearing with a small OD. The Corvette (and maybe the GTO?) use the outer pilot bearing position and uses a bearing that has a bigger OD. All LS style T56s have the same input shaft length.
Andrew
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