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I believe GM rated the Vette motor (LT-1) higher than the Z because their premiere car was NOT going to have the same or less hp than the second stringers. Camaros, Deuces etc. The L79 motors in the 65,66,67 chevelles and the 66-67 chevy 11's were the same as the vette. Same components anyways I believe. What was different the oil pan in the chevy 11's? Speak to me I learn more stuff everyday!
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I always thought it was keeping the vette top dog and the 10 HP dif was open element air cleaner vs the dual snorkel...
JG