John- thank you for the interest, I have two different sets of numbers that were used for the 57 thunderbird, first, these numbers are on the inboard side of the cylinder,(that is- readable from the passenger side of the car), FAA2155A and it also reads 1" DIA. There are other numbers on the cylinder that vary according to the time of cast
On the other cylinder, the letters BB appear on the drivers side of the cylinder, their are other numbers above the BB that vary depending upon the casting date. These of course are raised numbers and letters. Got one?
Richard