E-Bodies.org Cuda Challenger Forum

I don't know. If I get a chance this week I'll try to clean it up and get a better look

Ones with 2225601 casting number have the date code stamped in the side, year space day.
Ones with AANF and 2660809 casting numbers have the datecode stamped in the castings nose.  I don't have a sample handy but if I recall the order was reversed, day space year.

Found one  :banana:
Thanks every one !

I just looked some samples, an AANF was stamped 346(space)7 on the nose.  There also a "B" on the nose that looks to be a fresher stamp (this MC sample is a commercial rebuilt)
it has 317 casted on the top of the mounting flange.  Since this is a rebuilt that was sandblasted in the process, the last digit is not 100% legible but looks to be a 7.
I have 2 NOS ones with 2225601 casting numbers.  They have their datecodes stamped in the left side of their castings.  One is 6342H and has "254" casting date code cast in the bottom.  It also has "Bendix" cast in the bottom.
the second NOS one with the 2225601 casting number has a 7192 date code and "146" casting date code cast in the bottom.
The interesting thing I see on the 2 NOS ones is that their castings are E coded black.  I saw that a lot on Ford and GM master cylinders of that era made by Bendix, but Mopar disc brakes were painted black as an assembly and it's largely believed that the original 67-70 drum brake MCs were bare metal with plated caps.
Many of the NOS Mopar disc brake masters I've seen had "Made in Canada" stickers on them, a few stenciled, and a couple with mid 70s date codes were stamped made in Canada.
Bendix of course was based in South Bend Indiana and I think had manufacturing there too, but obviously they had a plant in Canada too. 
The date codes in the sometime in 69 and later disc brake MCs were stamped in the side and one digit for year space 3 digits for day. Before that, they had a tin tag on the bale wire with a 4 digit date code.
As I previously mentioned, I have no idea why the drum MCs have 3 different casting numbers.  I actually saw a reference in old analysis paperwork of an OE sample from back in the day of one they analyzed that had no casting number, in which case there were actually 4 different castings that were identical except for their part number or letters.
Barring talking to someone who worked at Bendix back in the day with a good memory or seeing their documentation, I don't think we will ever know for sure.  All I can theorize is that they needed so many for both new car production and for replacement parts, seeing how many different body styles used it, that they built at multiple plants, and used multiple casting houses, and maybe even subcontracted out some production to meet the volume?

So is it the conclusion of this thread that 1970 power drum brake E-bodies had the AANF master cylinder?

I don't know on that issue.  If it was, the cap and cap retaining bracket/bolt would have been painted too.  I haven't seen any pictures of "survivors" that showed evidence of any paint on the cap, but that doesn't mean it didn't ever happen?
I've rarely seen survivors that have what appears the be the original master cylinder installed anyway, being cast iron filled with moisture attracting brake fluid, they rarely lasted more than 5 to 8 years before going bad and needing replacement.  Fortunately since the 80s most master cylinders have been made with aluminum castings so we take it for granted that the ones on our daily drivers will probably never need replacement as was the case on previous generations of cars!
The 2 NOS samples I have that have black castings are not painted, they are E coated.  And one has a dust boot bolted on the flange for a non power application.