GM is working on a 5.5 OHC V8. I imagine that will be in the new Z28. and a larger S/C version of that (detuned from the Corvette) will be in the newer ZL1s.
OHC is a different animal that pushrod. and GM seems to be giving development that time it needs to have the right power, while being the most reliable, and having the least complexity possible.
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