The spark plug gap for a 1997 Chevy Silverado 1500 depends on the engine. You
must consult your owner's manual to find the correct specification for your specific engine (e.g., 4.3L, 5.0L, 5.7L, etc.). The gap will be listed in the maintenance section.
Don't rely on generalized information found online as incorrect gap settings can lead to poor engine performance, misfires, and damage. The owner's manual is the definitive source.