Spark plug gap for 1975 Chevy Chevelle 400 small block?

The recommended spark plug gap for a 1975 Chevy Chevelle with a 400 small block engine is typically 0.045 inches (1.14 mm). However, always double-check your owner's manual or a reputable service manual specific to your vehicle's year and engine configuration for the most accurate information. The gap might vary slightly depending on the type of spark plugs used.