What is the spark plug gap on a 1977 ford truck with 400 engine?

The recommended spark plug gap for a 1977 Ford truck with a 400 cubic inch engine is 0.035 to 0.040 inches. However, always double-check your owner's manual or a reputable repair manual specific to your truck's year and engine for the most accurate information. The gap can vary slightly depending on the specific spark plug used.