Ive got a buddy thats got some piston rings starting to fail him, and is wanting some input on what goes into an overhaul for a 12v. its got 223,000 hard miles on it, 4x4, auto, and the only mod is 6" stacks. no performance mods, even the lift pump is unchanged. So, what gets replaced? Gaskets, rings, rods, springs, valves? etc.....
Thanks