There should be a placard under the hood, with this information listed there. It can also be found in the owner's manual.
set it a .0035
.035
.045
0.035" gap
.045 inch.045 inch
.60, I just changed mine.
1-8-4-3-6-5-7-2
The 1986 Chevrolet 350 cubic inch engine spark plug gap is .027. Most spark plugs will be pre-gapped by the spark plug manufacturer.
AnswerThe spark plug gap is .035 on a 1993 GMC 350 TBI.
Generally, .028" unless you have a weak stator or coil.
A/C spark plug is---R44T and the gap is 0.035
The spark plug gap for an AR135 spark plug on a 350 SBC should be set at .034 inches. This is equal to .86 mm so a spark plug set to .9 mm should work correctly.