What is the spark plug gap for a 1978 Lincoln mark 5 with 400 engine in it?
The recommended spark plug gap for a 1978 Lincoln Mark V with a 400 cubic inch engine is 0.040 inches (1.02 mm). 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 or any modifications made.