.035 or .040, depends on year.
The standard spark plug gap for the Dodge 360 from the 1970s was .0035. It was a common gap for most of the muscle engines of the day.
.035"
.040 is factory...
.035 inch
.040 inch
.035 inch.035 inch
( 8 ) spark plugs for your 360 cubic inch V8 engine
The firing order for a 1978 318 and 360 is: 1843657 with the distributor rotating clockwise. Timing should be set around 4 degrees btdc (before top dead center).
According to one of Fords websites : The 360 cubic inch / 5.9 liter , V8 engine in a 1975 Ford F-150 has a spark plug gap of : ( .044 inch )
v8 318 360 FIRING ORDER 18436572
#1 is drivers front firing order is 18436572 distributor location is clockwise
#1 on the distributor cap of a Dodge 360 faces to the front - inline with the center of the engine ( according to the picture in my Chilton repair manual )