The gap is different for each type of ignition system being used. The old points-type distributors worked fine with .035". HEI needed more, up to .060" depending on the year.
You can usually find this info on auto parts stores websites if you know the year of your ignition system.
The 1989 Chevrolet 350 cubic inch engine spark plug gap is dependent upon the engine application. The most common spark plug gap for the Chevy 350 engine is .027.
AnswerThe spark plug gap is .035 on a 1993 GMC 350 TBI.
The Spark Plug Gap.060 (In thousandths of an inch)
typical spark plug gap for this engine is 0.035 inch
A/C spark plug is---R44T and the gap is 0.035
0.050
0.045
According to Champion spark plug applications chart, the correct gap for 1995 Chevy Tahoe 350 engine is .035
The proper spark plug gap for a 1980 Chevy 350 Pickup is .045, according to spark plug manufacturer (Autolite, Bosch, NGK) specs.
.060 thoundson gap
.045 spark plug gap
.045