line bore is always a most when u you use arp main bolts... Harris Performance has always done all my machine work great guys best prices.. also always balance the rotation assembly with balance shaft deleted and long life. If you havent deleted the balance shafts do so. When your building a high output built engine always balance that baby. Lets say a piston or rod combo is 2 or 3 grams more or less that will just make things so out of balance. When you invest allot of money into something like this its like a no brainer.