Originally Posted by BenFenner 
I'm glad you pointed that out actually. I was busy finally taking the time to read the massive "Thoughts on a full race motor setup" thread when I got to the part where Charles' name was mentioned. There was a link to his site and I went to find his 4-1 header to check firing order sort of assuming he'd have it right. I meant to double check this earlier, and was really hoping it wasn't the same header I bashed earlier. Low and behold, it's the same header I was upset with in that previous thread. =(
So I came back here to make a post about it but you'd already done that for me.
It seems Charles' 4-2-1 header is correct and his 4-1 header is not. I would like make my point clearer here with some pictures.
Here is the header in question:
And here it is again from a different angle.
And here it is with the cylinders marked and firing order shown (1-3-2-4).
Charles, now that I have you here, can you explain why cylinders 2 and 4 seem to be dumping in the wrong places? Is it for packaging reasons?
For those who don't know what I'm on about, here's the way things should be with a firing order of 1-3-2-4:
Since exhaust scavenging works best from adjacent tubes you want the order to "rotate" around the collector and not have to scavenge from a pipe across the merging pyramid.
What's wrong with the header? You do realize that firing order for our engine is 1-3-4-2.
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