Inline 4 Cylinder Firing Orders:

Make Engine Firing Order
Chrysler Most Inline 4 Cylinders 1-3-4-2
Ford Most Inline 4 Cylinders 1-3-4-2
General Motors Most Inline 4 Cylinders 1-3-4-2

Inline 6 Cylinder Firing Orders:

Make Engine Firing Order
Chrysler Most Inline 6 Cylinders 1-5-3-6-2-4
Ford Most Inline 6 Cylinders 1-5-3-6-2-4
General Motors Most Inline 6 Cylinders 1-5-3-6-2-4

V8 Firing Orders & Distributor Rotation:

Make Engine Distributor Rotation Firing Order
AMC Most V8 Engines Clockwise 1-8-4-3-6-5-7-2
Buick Most V8 Except HEI Clockwise 1-8-4-3-6-5-7-2
Chevrolet All V8 Engines Clockwise 1-8-4-3-6-5-7-2
Chrysler All V8 Including Hemi Clockwise 1-8-4-3-6-5-7-2
Ford 5.0L HO, 351, 400 Counter-Clockwise 1-3-7-2-6-5-4-8
Ford All V8 Not Listed Above Counter-Clockwise 1-5-4-2-6-3-7-8
Oldsmobile 1967 And Up V8 Counter-Clockwise 1-8-4-3-6-5-7-2
Pontiac Most 1955-81 V8 Counter-Clockwise 1-8-4-3-6-5-7-2
Pontiac 307 Clockwise 1-8-4-3-6-5-7-2