Firing Orders by Engine

Each firing order here is from the maker's service manuals or three agreeing references, with the cylinder numbering and, for distributor engines, which way the rotor turns.

How makers number the cylinders

GM, Chrysler, Dodge, Ram, Jeep and AMC V8s and V6s put the odd cylinders on the driver's side and the even ones on the passenger side, numbered front to back: 1-3-5-7 and 2-4-6-8.

Ford numbers by bank instead: 1-2-3-4 down the passenger side, front to back, then 5-6-7-8 down the driver's side (V6s: 1-2-3 and 4-5-6). That is why Ford firing orders read so differently from a Chevy's even though the engines are the same layout. Ford's diesels built by Navistar (6.9 and 7.3 IDI, 7.3, 6.0 and 6.4 Power Stroke) are the exception: odd cylinders on the passenger side.

Other exceptions: the Buick Nailhead, Cadillac 472/500 and Duramax put the odd cylinders on the passenger side; Nissan VQ V6s and Subaru boxers put them on the right; Honda's V6s number the rear bank 1-2-3. Inline engines count from the timing end.

Ford 302: two firing orders

The 5.0 HO, and the 351 Windsor, fire 1-3-7-2-6-5-4-8. Other 289s and 302s fire 1-5-4-2-6-3-7-8, and Ford trucks with the 5.0 kept that order through at least 1993. Check which camshaft is in the engine before setting the wires: an HO-order cam won't run with the wires in 302 order.

Engines