Depends on the year, make, and model vehicle is it installed in.
The proper spark plug gap for a 1980 Chevy 350 Pickup is .045, according to spark plug manufacturer (Autolite, Bosch, NGK) specs.
.045
.035
.060
.035
.035
.35
It is .045
The proper plug gap is .035" or thirty five thousandths.
A/C spark plug is---R44T and the gap is 0.035
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.
i assume you mean gap,which should be 45/1000 ths