4,2 cylinder bores are NiKaSil coated 3,6 cylinder bores are sulfid etched Rebuilding by drilling a PT is no problem, but on a 4,2 you have to recoat (with NiKaSil or whatever). Bastian > Both the 3.6 and the 4.2 cylinder bores are bare aluminium/silicon, and > rebuilding them is not a problem.