180 degree headers WAS:Re: Turbo header design

[Eric Aos]

>>   The only firing order i am familiar with is for a GM engine, which
is
>>1-8-4-3-6-5-7-2.  Picture the cyliders as two rows (which they are):
>>
>>     1     2        you can see that #1's 180 degree partner is #6,
#8's
>>     3     4        is #5, #4's is #7 and #3's is #2.
>>     5     6
>>     7     8
>
>#1 and #6 are 180 degrees apart on the distributor, not the crank. #1
and #4
>are 180 degrees apart on the crank. Aren't they? What cylinders are
grouped
>together with NASCAR 180 degree headers?
>
>Jon
>
><snip>
> I think he meant 360 degrees--- :-)

Don't forget the 90deg Bank Angle so with #6 following #4 by 90, it
works out.