the firing order is cast in to the intake manifold
18436572
1-8-4-3-6-5-7-2
The suggested spark plug gap for a 1973 Harley Davidson is 0.040. It is the suggested gap for most of the spark plugs of that era.
1-8-4-3-6-5-7-2
.035
1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 The distributor rotor turns COUNTERCLOCKWISE The distributor cap is installed with the marked # 1 position facing to the rear and slightly towards the drivers side The engine cylinders / spark plugs are numbered : FIREWALL 4 - 8 3 - 7 2 - 6 1 - 5 FRONT
Bad coil wire, bad coil, etc...
According to one of Fords websites : For a 1973 Ford Bronco 5.0 L ( 302 cubic inch V8 engine ) ( The spark plugs are gapped at .035 inch )
According to one of Fords websites : For a 1973 Lincoln Mark IV , 7.5 liter / 460 cubic inch V8 engine : ( the spark plugs are gapped at .035 inch )
the gap on the distributor points is .016, the timing is advanced 4 degrees and the spark plug gap is .030
It depends on the brand of plugs. If you use Champion plugs the gap is .035. You can check gap at Champion plugs or search another brand. Hope this helps. the gap is .035 on any plug you use.
The firing order is ( 1 - 8 - 4 - 3 - 6 - 5 - 7 - 2 ) The distributor rotor turns CLOCKWISE The marked # 1 position on the distributor cap faces to the FRONT / CENTER The engine cylinder / spark plug locations are numbered : firewall 8 - 7 6 - 5 4 - 3 2 - 1 front