What is the firing order of the Ford flathead V8?

The Ford flathead V8’s firing order is 1-5-4-8-6-3-7-2. This sequence specifies when each cylinder receives its spark and begins its power stroke as the crankshaft rotates.

Ford introduced the flathead V8 in 1932, making V8 power available in relatively affordable mass-market cars and trucks. Its valves were located in the block beside the cylinders rather than in the cylinder head, giving the engine its “flathead” or “L-head” name.

The firing order is often confused with the numbering sequence. Ford numbered cylinders 1 through 4 on one bank and 5 through 8 on the other, but cylinder No. 1 is not simply the frontmost cylinder in the way many later V8 owners expect. That unusual numbering contributes to the flathead’s distinctive ignition sequence.

The same firing order was used across Ford and Mercury flathead V8 applications, including the 221, 239, and 255 cubic-inch versions. The engine remained in U.S. consumer production through 1953, with Canadian production continuing into 1954.