180 degree headers WAS:Re: Turbo header design

[Jon Fedock]

<snipperoo>

>Clarence,
>  This is easily done with an inline four having a 1-3-4-2 firing order,
>as you just pair cyl's 1-4 and 2-3 together.  Commonly done in NA
>headers and OEM manifolds too.  However, true 180 degree headers on a V8
>typically take up a lot of space.
>   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>