I gave the GAGT a tune up Tuesday... coil, wires, plugs, and air filter. It had developed a miss at idle in damp weather. And idled a hair rough in any weather. The original parts were toast, and the air box/filter were full of dirt and rocks. It definitely runs much smoother. Amazing that it averaged 25.5 MPG and got 27.5 a few times.
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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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