I've never worked on an LT1, other than helping my Son with minor things on his Camaro. But, if I remember right the harmonic balancer is a 2 piece bolt together unit. The balancer part can be removed without needing to use a puller to remove the hub part. The hub that stays on the crank snout isn't in the way = no puller needed. I could be wrong, like I say my son works on his car and I just assist if he needs an extra pair of hands now & then. Someone will chime in I'm sure & let us know if it actually is a 2 pc. unit.