The recommended spark plug gap for a 1997 Chevy Silverado V8 depends on the specific engine. The Silverado came with several different V8 engines that year (e.g., 5.0L, 5.7L).
You must consult your owner's manual. The manual will specify the exact gap for your engine.
Without knowing the exact engine displacement, I cannot provide the correct information. Attempting to use the wrong gap can lead to misfires and poor engine performance.