.035
.035
.45
0.060
35 to 40 percent gap
R45TS
If it is a stock original engine and ignition system the gap would be .035".
.045.
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.
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.