If the Z/28 is n/a, I bet it will be something along the lines of the LS6. Better heads, hotter cam, better intake manifold. The LS6 saw a 15% increase over the LS1. That would put the LT6 at 530 hp.
That should keep development costs down as well. Put the extra money into the light weighting. Imagine a Z/28 making 530 hp, 480 tq and weighing 3600 lbs.
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