Earliest dated 074 ZL-1 heads??? First L-88??
When did the first 69 L-88 get made??When did GM start making the ZL-1 074 heads...I have a pair dated July 17 and August 31 1968...did GM use these heads in 68?? Did the 68 L-88 use these heads??? Did the first L-88 vette get produced prior to the first ZL-1?? could these be preproduction heads?? thanks
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