Ford 351C, 351M & 400M Firing Order Diagram 1-3-7-2-6-5-4-8 & Distributor Cap

This document is a firing order reference diagram for Ford 351C (Cleveland), 351M, and 400M V8 engines, published by gtsparkplugs.com. The firing order is prominently displayed across the top as 1-3-7-2-6-5-4-8. Below the title is a top-down view of a V8 engine block with cylinder numbering: the left bank is numbered 1 through 4 (with cylinder 1 nearest the front) and the right bank is numbered 5 through 8 (cylinder 5 nearest the front). At the bottom, a distributor cap diagram shows the terminal positions for spark plug wires (1, 8, 4, 5, 6, 2, 7, 3 arranged around the cap) and notes that the distributor rotates counter-clockwise, with a curved arrow illustrating the rotation direction. Two orange "Clip" callouts with arrows indicate the locations of the distributor cap retaining clips, which help orient the cap correctly. A reader can use this diagram to correctly route spark plug wires from the distributor cap to the appropriate cylinders when performing a tune-up, distributor replacement, or diagnosing a no-start/misfire condition on these Ford engines. The 400M engine option was available in vehicles such as the uploader's 1978 Ford Bronco.