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Just a quick note on the engine displacement. The reason that the Z28 had the DZ302 was that Trans Am cars were limited to a 5.0 liter max displacement. With no race series to enforce restrictions, there is no reason to not put the 6.2 or even , theoretically (I say theoretically because the cost of the LS7 makes it prohibitively expensive) the LS7 since the structure (block, heads etc) is going to weigh extremely close to the what a 5.3 would (if not slightly less due to less mass in the block since it will have larger cylinder bores).
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