you should be able to find this info on the "vehicle id tag" (sticker) that should be on the radiator support. if the sticker is gone or not readable, just call the dealership or a parts store and most of them will be happy to provide you with the info,
0.035 in.
Gap is .035
The corect gap is .035
A person must leave the right size gap for the spark plugs when changing them. The 1999 Chevy Suburban has a spark plug gap of .060 inches.
0.045
18436572
0.35
The spark plug gap on 1977 Chevy truck 454 should be set at .045 inches. Spark plugs are preset at the factory and should need no adjustments prior to being installed.
25-.30
The 1994 Chevrolet 7.4 liter engine spark plug gap is .034. Most spark plugs will come pre-gapped from the spark plug manufacturer.
.045
Spark plugs are a cheap and quick fix if one goes out. The cost to replace one on a 454 chevy engine however can differ depending in the spark plug brand.