Impossible to answer that question. All starters are different. It is a trail and error deal. You need to start with THIN ones and add as needed until the starter is quite.
5.7l & 7.4 = .60
Gap is .035
The spark plug gap in your 1999 Chevrolet suburban is dependent upon the type of engine. The standard engine spark plug gap is .011.
The corect gap is .035
I am not 100% sure, but I do not believe the air gap can be adjusted on that compressor. Manufacturers use washers/ shims to set the air gap, and to adjust it, you would need to pull off the hub and check the shims (start with pulling only one off).
0.060 inch
0.035" gap
A person must leave the right size gap for the spark plugs when changing them. The 1999 Chevy Suburban has a spark plug gap of .060 inches.
The spark plug gap for a 2004 Chevrolet Suburban should be set at .040 inches. The new spark plugs are pre-gapped and do not need adjusting.
0.035 in.
0.035 inches
.035