What is the firing order for the Ford 351C, 351M, and 400M engines?

The firing order is 1-3-7-2-6-5-4-8, as shown across the top of the diagram.

Which direction does the distributor rotate on the 351C/351M/400M?

The distributor rotates counter-clockwise, as stated on the diagram and shown by the curved arrow on the distributor cap.

How are the cylinders numbered on these Ford engines?

One bank is numbered 1-2-3-4 from front to rear, and the other bank is numbered 5-6-7-8 from front to rear, per the engine block diagram.

How are the spark plug wire terminals arranged on the distributor cap?

Going clockwise around the cap from the top: 1, 8, 4, 5, 6, 2, 7, 3. The wires are connected in firing order following the counter-clockwise rotor rotation.

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

351C/351M/400M engine firing order diagram with cylinder numbering and distributor rotation

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Firing-order schematic for Ford 351C, 351M and 400M V8 engines showing cylinder sequence 1-3-7-2-6-5-4-8 and counter-clockwise distributor rotation.

AI caption April 2017 · Photo 310 of 356

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.

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Frequently asked questions

What is the firing order for the Ford 351C, 351M, and 400M engines?: The firing order is 1-3-7-2-6-5-4-8, as shown across the top of the diagram.
Which direction does the distributor rotate on the 351C/351M/400M?: The distributor rotates counter-clockwise, as stated on the diagram and shown by the curved arrow on the distributor cap.
How are the cylinders numbered on these Ford engines?: One bank is numbered 1-2-3-4 from front to rear, and the other bank is numbered 5-6-7-8 from front to rear, per the engine block diagram.
How are the spark plug wire terminals arranged on the distributor cap?: Going clockwise around the cap from the top: 1, 8, 4, 5, 6, 2, 7, 3. The wires are connected in firing order following the counter-clockwise rotor rotation.