I'll agree with what everyone else said. After my usual machinist told me I couldn't run my 440-1's with a 4.5" bore, I gave Nick a call and have been very happy that I did. Nick ported my heads, had a cam ground for me, and ordered my rotating assembly for me. I had a few problems that I ran into during the assembly and Nick was a phone call away for help. After my experience with Comp-U-Flow, I can guarantee that they will be the only ones I deal with from now on for my engine services.