Mine is an Gen iron block from KCR. Keith did all the machine work and detail painting. I'm very pleased. They do require quite a bit of machine work and KC has built plenty of them and felt worth it to have them do the work. Mine is a 4.250" bore size. It's heavy too!!! 265 lbs or there abouts on the G lift-o-meter....LOL Waaay heavier than a oem block anyways.

G.