Originally Posted by DRfrank
you'd have to get brand new pistons that fit the ls block (84mm? anyone want to confirm?) BUT i thought i heard something before about notches in the pistons for valve clearence.... i'd really like to know this myself, this sounds like a pretty good build up, but for the money why not just get a c5.. or at least bore it out to 2 liters...
81mm. Pick up a set of aftermarket pistons and rods for the buildup. Any reputable piston maker such as JE or Wiesco will have what you are looking for. Claying the motor for clearances is always a good idea when building up the compression ratio.