I recently picked up a ( new to me) 96 escort 5 spd wagon with low miles and I am going through and doing some preventive maintenance like new timing belt, fluids, etc before putting her on the road. I know all about the issue that the original Ford Intake valve seats have and figure if the head is original to the car, then I would rather take the time and expense to put a rebuilt head on the car now before any damage happens down the road. I've heard that there is some sort of mark ( maybe an "R" ) that would be stamped into the head in the area that is under the valve cover to tell when a head has been rebuilt. Looking under the valve cover I can see clearly an "r" that is stamped into the head on the intake side, between cylinders 2 & 3. Does this "R" mean that the head has been rebuilt, or does it actually mean anything?