Firing Orders

Cylinder numbering varies between manufacturers — the same firing order can mean different physical cylinders. Always confirm cylinder #1 location for your specific engine before attaching plug wires.

V8 Engines

Engine Family	Firing Order	Cyl #1 Location	Distributor Rotation
Chevrolet SBC / BBC (Gen I/II)	1-8-4-3-6-5-7-2	Front, driver side	Clockwise
Chevrolet LS / Vortec (Gen III/IV)	1-8-7-2-6-5-4-3	Front, driver side	(coil-on-plug)
Ford 260 / 289 / 302 Windsor	1-5-4-2-6-3-7-8	Front, passenger side	Counter-clockwise
Ford 302 HO / 5.0 / 351W (1982+)	1-3-7-2-6-5-4-8	Front, passenger side	Counter-clockwise
Ford 351 Cleveland / 351M / 400	1-3-7-2-6-5-4-8	Front, passenger side	Counter-clockwise