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.060
The 1991 350 cubic and Chevrolet engine spark plug gap is .027. Most spark plugs will come pre-gapped from the manufacturer.
0.060
The proper spark plug gap for a 1980 Chevy 350 Pickup is .045, according to spark plug manufacturer (Autolite, Bosch, NGK) specs.
0.035
.045
.035
.060
.035
The proper plug gap is .035" or thirty five thousandths.
.35
It is .045