[AJ]

You choose your pistons and rods based on the engine you want to build. Take into consideration rod ratio, desired compression ratio, and maybe anything extra to match diff rods up with pistons, ect ect. Once you know what your going to use you have a credible machine shop do the work on the block. There's actually quite a bit that can be listed in the mix. Torque plates, sleeved, bore, hone, ect ect. It can get fairly in depth or it can be done fairly low key.