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Too heavy and it's not mass produced. Not to mention the casting core shift concerns.
The aluminum LS block is more than capable. Is the block a weak link in the 638 hp LS9? No.
Take an LS3 - bigger cam, better valve train components, fully forged rotating assembly, better exhaust manifolds (LS7 style), dual mode exhaust, factory CAI... fix the weak links - timing chain tensioner, oil pump, rockers, p/s pump ... that would be the perfect Z28 motor.
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