[Mike51Merc]

When it comes to exhaust pulses, 90 degree crank V8s have a syncopated rhythm. What I mean is that regarding left and right banks, there isn't a left-right balance to exhaust beats (like there is with a 180 degree crank in many European V8s). The result is a loss of scavenging, but the benefit is a smoother engine.

Looking at the flathead firing order, the middle cylinders (with the shared ports) are separated in order by a cylinder on the opposite side, which is pretty much the same as you'll find on a more modern overhead valve Ford V8.