Thanks for this post. I'm planning a simular build w/my X block & indy 360-1 CNC.This is to out power my 408 W-5. What is your bore size going to be ? My X block has some core shift between the cylinders(.180-.200 thickness currently) and I will most likly offset bore that bank .030-.050 and fill w/hardblock.I was hoping to bore mine 4.1-4.125.Thanks again for the post & pictures.