Wow. I pulled the valve cover off the 3.5 that's undergoing the 4.0 stroker rebuild and was I astonished. Tons of hardened carbonized sludge. In a 3.5. Guys, this is a result of either not changing your oil often enough or using cheap oil or that old favorite Quaker State which has been known to gum up more engines, because of the parrafin it contains.
Check these out:
Well the bare block and bare heads will be getting hot tanked so they will be clean inside and out. Everything else that goes back in will be new, with the exception of the rocker arms but that will depend on if they are still usuable. So it's not really an issue to the rebuild, more of a freak show kind of thing!