I took them off, tired of fitment issues. Noise, heat, etc. It's not worth the hassle to me. Not to mention you can make plenty of power on stock manifolds with the right combination.
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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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