hi there, firing order is as folows: 18436572 !
On the 305 engine the number one plug position is the first one on the right side while you are facing the engine.
The spark plug gap for a 1979 Ford F-250 with a 400 engine is between 0.42 and 0.46. This range is included in the factory settings.
.035
60 for gasoline engine
The spark plug firing order for the 4.9 L ( 300 cubic inch ) straight 6 cylinder engine is ( 1 - 5 - 3 - 6 - 2 - 4 ) ------------------------------------------------------------------------------------------------------------ The distributor rotor turns CLOCKWISE -------------------------------------------------------- The distributor cap is installed with the marked # 1 position facing away from the engine --------------------------------------------------------- The engine cylinders / spark plugs are numbered 1 to 6 , going from the front of the engine to the rear of the engine
the gap is .060 thou of inch.
( .044 inch ) according to motorcraft.com
The 1976 351 Ford engine spark plug gap is .034. Most spark plugs will come pre-gapped from the spark plug manufacturer.
( .044 inch ) according to fordparts.com for the 300 cubic inch / 4.9 liter inline six cylinder engine in a 1979 Ford F-150
The spark plug firing order on your 400 ( 6.6 L ) is ( 1-3-7-2-6-5-4-8 ) The distributor rotor rotates COUNTER CLOCKWISE The # 1 position on the cap ( should be marked ) and the cap is installed with the # 1 position facing to the rear and slightly towards drivers side of engine
The crankshaft position sensor is mounted on the front of the engine. It bolts on, and has one wiring plug.
The # 1 position for the # 1 spark plug cable is usually marked then you follow the spark plug firing order and direction of distributor rotation for your particular engine . What type of vehicle , year , and engine size do you have ?