The fan blade you want is a 3947772, and the clutch you'll want to use is a Hayden part # 2747 HD unit. It will will run nice and cool, plus damn near last forever.
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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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