I went to a shop called Turbo Diesel and had a quote on how much that would charge me to rebuild the top half of my 8.1L. Keep in mind I already bought all the part from comp cams (cam shaft,rollers,lifters,valve springs,push rods,etc.) it cost like 1000 total. The man at the place told me it would take 30 hours at 90 dollars an hour. Just to install the parts was 3500 he estimated. I also was going to ask them to send my heads off to be shaved. He told me no telling what that will cost. Does this sound right to you?