Are they 305 heads? Everything I found online says they are 350 heads... center bolt valve cover pattern.
12506450
350
87-94
1.94/1.50
76cc
I think the cc is wrong, usually heads from that vintage are 64cc.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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