The proper plug gap is .035" or thirty five thousandths.
.035
0.060 Plug gap.
.060
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0.035
.40 gap
The 1998 Chevrolet Silverado V-8 engine spark plug gap is .031. Most spark plugs come pre-gapped from the spark plug manufacturer.
100.5 mm
.035
,030"
0.060
0.060 inch