What is the spark plug gap on a 1977 trans am 6.6l 400?
The recommended spark plug gap for a 1977 Pontiac Trans Am with the 6.6L (400 cubic inch) engine is 0.035 inches to 0.045 inches. However, always double-check your owner's manual or a reputable repair manual specific to that year and model for the most accurate information. Slight variations might exist depending on the specific engine configuration and the type of spark plugs used.