Ok, a little more information on the 5460465 master cylinder in my Norwood built, 01C '69 RS.
As shown in one of the previous attached pictures in this posting, my car has power (drum) brakes resulting in the master cylinder being mounted inclined and hence the need for it to have bleeder valves. On my master cylinder, the casting number, 5460465, is on the bottom on the RH (passenger) side with the CT application code stamped into the tab at the front of the master cylinder.
On the LH (driver) side on the bottom are two additional numbers. On the bottom to the front is the Julian date code - "170" (June 19). On the bottom to the rear is the foundry pattern number "D14". (Note link below. In other posts dealing with disc brake cars, the number D7 is found on the bottom of the master cylinder. JohnZ explains that the D7 is not a date code, but a foundry pattern number. Same should be true here. I am assuming that the D14 number is the foundry pattern number for the 5460465 master cylinder.) http://www.camaros.org/forum/index.php?topic=3371.msg21966#msg21966
I believe what we are beginning to appreciate, and need to document, is whether or not it is true that there were four different master cylinders covering: manual drum (no bleeders), power drum (with bleeders), manual disc (no bleeders), and power disc (with bleeders); and were the same master cylinder casting numbers used for all 1st Gen Camaros???
Come on guys - go look at your master cylinders and help Kurt with the information that he has requested. "Right now, we need more data on power drum cars, 67-69. Anyone? Looking for casting #, stamped code, power or manual, bleeders or not? Data on manual drum cars is fine too!"
You may not be able to photograph the numbers, but you can read them easily enough with an inspection mirror and a flashlight and post what you find back to the CRG forum.