You will need two special tools to remove and replace the stock LS3 harmonic balancer, ... but it is essentially a 6-inch M16 x 2.0 threaded rod that is slightly longer than the balancer bolt.

Hot Rod Garage Ep. 11 - The Ultimate Bolt-In Chevy LS3 Engine Swap. Staff Writer Writer Jan 22, 2015. 0:00 / 0:00. On this episode of Hot Rod Garage, Presented by Lincoln Tech, ...