Index the flywheel?

[MikeSak]

I'm used to 5.0s where the flywheel bolts will only line up one way. With this 2.9 I could spin the flywheel all the way around and the bolts line up evey time. Do I need to index the flywheel on a 2.9?

 

[adsm08]

2.9 is internally balanced. No indexing needed.

Also, since the 2.9 is internally balanced, the flywheel and damper need not be weight matched, and low end/take off performance gains can be had by installing a larger (heavier) 4.0 flywheel and clutch.