The bore was made up to .04 inches too big on a large batch of these engines in 1994 and 1995- the error was made at 4 different Ford plants- that is why Ford extended the warranty on these engines for head gasket repairs and offered a new re designed head gasket. Make sure to have the re designed head gasket when you do any work on the heads!- this info is available from the Chilton database and probably Mitchel On Demand and others as well