David Freiburger explains what an engine's firing order is, describes companion cylinders, and shows how a camshaft can be used to swap firing orders. The most common for V8s are the 4/7 and 3/2 swaps for the 1-8-4-3-6-5-7-2 firing order, and when you swap 4 and 7 as well as 3 and 3, you get the LS firing order which is 1-8-7-2-6-5-4-3. Many Fords use these same principles, though the cylinders are numbered differently so the firing orders are expressed differently--and the reasons for this are explained in the video.
Why change firing order? Changing a 1-8-4-3-6-5-7-2 engine to a 4/7 swap sometimes makes a tiny bit of extra power. Swapping both 4/7 and 3/2 reduces crankshaft harmonics and evens out the load on the crankshaft mains, which can lead to smoothness and longevity.
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