Spark plug gap 1991 Chevy van 350 cu?
The recommended spark plug gap for a 1991 Chevy van with a 350 cubic inch (5.7L) engine is 0.035 inches (0.89 mm). However, always double-check your owner's manual or a reliable repair manual specific to your van's year and engine type. Slight variations may exist depending on the specific engine configuration and spark plug type.