Couldn't they just throw on a bigger Eaton Supercharger (2.6L) onto the LT4 with a tune and some cooling tweaks to get to that 755hp mark?
Does it really have to be the actual LT5 with the different crankshaft etc? Probably not. The LT4 can supposedly support up to 1000whp so a bigger Supercharger wouldn't necessarily need so much R&D.
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