Ford 351M & 400 V8 Firing Order Diagram - Distributor Wiring & Timing Marks

This document is a spark plug wiring and firing order schematic for Ford 351M and 400 cubic-inch V8 engines. The diagram shows a top view of the engine with cylinder numbering: cylinders 8, 7, 6, 5 on one bank and 4, 3, 2, 1 on the other. A central distributor cap illustration shows the terminal positions (8, 4, 5, 6, 2, 7, 3, 1 arranged around the cap) with plug wires routed to each cylinder, and an arrow indicating the direction of rotor rotation. A note states that on 351M and 400 engines equipped with Frigidaire A/C only, the timing pointer is viewed from the left, while on all other applications it is viewed from the right. An inset detail of the crankshaft damper and timing pointer is labeled "FRONT" and shows the ignition timing scale graduations: BTDC, 30°, 20°, 10°, TC (top center), 10°, and ATDC. A reader can use this diagram to correctly route spark plug wires from the distributor cap to each cylinder and to locate and read the timing marks when setting ignition timing on these engines.