[Bob In Ct]

I don't know of any american V8 that fires on alternating sides of the block through all 8 cylinders. During 2 revolutions (all cylinders fire once) two cylinders on the left side fire in order and 2 cylinders on the right side fire in order. Because of this we tend to get high pressure pulses on one side and then the other. Take a look at the exhaust setup on the old Ford GT40s, you will notice the headers are arranged so that the pulses always alternate left/right/left/right etc.. This was done to extract every last HP available. The closest thing to this on the street is the "X" pipe seen on most undercar V8 exhaust systems. It's the poor man's GT40 exhaust setup. By using an X pipe (or less so an "H" pipe) we can extract a little more HP by providing a little more scavenging of the exhaust gases.

Bob

Windsor 1,3,7,2,6,5,4,8
Others 1,5,4,2,6,3,7,8