I have a 1968 Z28 motor
#7
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Good question. I'm curious if maybe it was an engine availability thing with the DZ. Could be GM was already stocking up the DZ engines for the upcoming 69 model, but used it on some 68's. Searching for a 68 DZ 302 turns up anything from "it was only a 69 engine", to "it was a late 68-69 engine". Since GM has been known more than once to use leftover previous model parts on next year early models till the parts run out, to make early run models unique, I don't find it unbelievable that they could have done it the other way around.