LS Tech: Installing an ATI Harmonic Balancer
ARP Crankshaft Bolt (234-2503)
http://amzn.to/2EvEkFv
Factory bolt is single use only
ATI Super Damper (C5 LS1 - 917278)
http://amzn.to/2CqZ17k
*Be sure to get the correct part # for your application)
Harmonic Balancer Installation Tool
https://amzn.to/3o4qlNF
Flywheel Holding Tool (if you have the flywheel installed, this works well for keeping the crank from turning)
https://amzn.to/2rjJ2jG
How to install an ATI Harmonic Balancer on an LS1 engine.