Ford 5.0L HO / 5.8L V8 Firing Order Diagram 1-3-7-2-6-5-4-8 & Plug Wire Routing

This schematic shows the firing order and spark plug wire routing for Ford 5.0L HO and 5.8L V8 engines. The diagram depicts the engine from above with the distributor at the front, showing both cylinder banks: cylinders 1 through 4 on one bank and 5 through 8 on the other. Callout circles identify each cylinder position, and the drawing illustrates how the spark plug wires should be routed from the distributor cap to each cylinder. A prominent attention note warns that to prevent crossfire (induced misfiring between adjacent wires), the spark plug wires for cylinders 1, 3, 5 and 6 must be routed exactly as shown in the illustration. The document also includes a timing scale illustration marked TC, 10, 20, and 30 with an arrow indicating the 10-degree mark, and states that base ignition timing is 10 degrees. The firing order is given clearly at the bottom: 1-3-7-2-6-5-4-8, which is the HO firing order distinct from the standard 5.0L order. This reference is useful when replacing spark plug wires, installing a distributor, or diagnosing misfires on these engines.