.035 gap standard and stock
The spark plug gap for a 1991 Chevy Silverado 2500 V8-350 is .035, according to major spark plug manufacturers (i.e. Autolite, Bosch, Denso, NGK).
0.060 Plug gap.
.40 gap
.060
0.035
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The 1998 Chevrolet Silverado V-8 engine spark plug gap is .031. Most spark plugs come pre-gapped from the spark plug manufacturer.
.035
I believe it is 45
0.060 inch
.035
0.060