Haven't had any issues before, but only thing I do to EVERY "FE" that comes in is to do the oil galley mod. The casting is thin between the water jacket and oil galley for the heads, so what you do is install a 2" long 1/4" split roll pin into the hole. The split faces the lifter valley, and you drive it to just over 5" to the bottom of the pin. This should always be done, as you do not know if and when it may crack and leak. If anyone is interested, I can post up the info from the AERA bulletin.