Which engine?
According to the Hanes Manual: .044
for what size of engine ?
That would depend on which engine size you have
www.motorcraft.com shows (.044 inch ) plug gap on the 1989 F150 300 cubic inch ( 4.9 L ) straight 6 cylinder engine
1987 Ford Truck F150 1/2 ton P/U 2WD 4.9L FI 6cylThe Spark Plug Gap.044 (In thousandths of an inch)
( .054 inch ) according to www.motorcraft.com
passenger side of engine , front cylinder
The spark plug gap is .054"
The spark plug gap is .054"
The 1991 350 cubic and Chevrolet engine spark plug gap is .027. Most spark plugs will come pre-gapped from the manufacturer.
The spark plug firing order is ( 1 - 5 - 3 - 6 - 2 - 4 ) The distributor rotor turns CLOCKWISE # 1 position on distributor cap faces AWAY from the engine The engine cylinders / spark plugs are numbered 1 to 6 going from front to rear