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.
.045 spark plug gap
typical spark plug gap for this engine is 0.035 inch
Factory plug TYPE is R45Ts plug. Gap is 0.045
According to Champion spark plug applications chart, the correct gap for 1995 Chevy Tahoe 350 engine is .035
If it is a stock original engine and ignition system the gap would be .035".
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.
The correct spark plug gap does not depend on which plug you use, it is dependant on what engine it is installed in. The same plug can be used in many different engines, and each engine might have a different gap specification. Instead, you need to ask something like: What is the correct spark plug gap for a 1993 Chevy 350 engine? (or whatever engine you have).
The Spark Plug Gap.060 (In thousandths of an inch)
.060 thoundson gap
On my 1992 350 van it's .35 gap
( .035 inch ) for a 1972 Chevrolet 350 cubic inch V8 engine
It is important to gap the spark plugs of an engine. The spark plug gap measurement for this engine is 0.044 inches.