In 71' GM swapped to 8.5 10 bolts in the Camaro and Nova car lines. Not sure why they did that and left the 12 bolt in the Chevelles.
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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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