New Chev Firing Order

[Gary Derian]

It's not obvious to me if there are vibration benefits but a tri-Y header
has to be redesigned.

Gary Derian <gderian at cybergate.net>



>Yup...this is the new LS1 firing order. They just flipped 7 and
>4....which is no big deal, just a cam change of 180 degrees between the
>lobes on these cylinders...  Why they did this...who knows. Maybe it
>reduces vibration, or results in a more balanced exhaust flow?
>
>TTYL!
>
>Larry
>
>> Subject: New Chev Firing Order
>>
>> Hi Folks,
>>       While working on this 99 Chevy truck I found they changed the
>> firing
>> order from 18436572 to 18736542......since it is coil on plug I only
>> found
>> this out by checking the camshaft....does anyone know why the firing
>> order
>> change and is the 98 vette the same???????
>> -Carl Summers