Be careful with rebuild parts- - - - -The big V-6's, and, I'm sure, the V-12's had balance issues. I worked with an industrial engine machine shop some time back that did a lot of work on the old big 6's, and a few V-12's for customers who were trying to keep them in service. It was important to keep the rotating assembly for a particular engine pretty much intact, as they were extremely sensitive to balance. If you bore it and install different pistons, you might create some vibration problems unless you match piston weights exactly.
If the pistons are serviceable after a cleanup, it might be wiser to sleeve a pitted cylinder and go back with the original standard-bore pistons, instead of boring the cylinders oversize and replacing all the pistons.
Jerry
