LS1 firing order

[Terry]

Joe Boucher wrote:
> 
> Here's a guess.  Back in the carb days you could have a problem with the number 5
> cylinder stealing some of the fuel charge from the number 7 cylinder, leaning out the
> number 7.  With fuel injection at the intake valve, that shouldn't be that bad of a
> problem.  There are crankshaft vibration considerations of the firing order that are
> orders of magnitude above my head.
>

You're on the right track...   Here's a blurb from one of the rags...

"The LS1 uses a revised firing order that solves the small-blocks
long-standing problem of adjacent cylinders firing in succession.
The revised firing order improves idle quality and reduces
engine vibration."

T.