Master cylinder date codes

[Walter Keegan]

I apologize if I missed this somewhere. I have been trying to decipher the date code on a 67 Camaro 5460346 WT master cylinder. I have seen multiple posts that refer to D1, D2 etc.  I cannot find what date this refers too. I did see a rebuilt MC 5460346  for sale with D6=274 I still cannot find anything which tells me what this means. Any help is appreciated. Thank you.

[GMAD_Van Nuys]

CRG information on master cylinders:

http://www.camaros.org/suspen.shtml#Brakecomp

[Walter Keegan]

Yea. Thanks. I’ve read all that. Nothing there related to date codes for specific MC 5460346

[Pacecar]

Date is Julian and cast into into the driver side of the MC. The front bale wire clasp obscures the first digits

[GMAD_Van Nuys]

According to the Corvette Forum website, date codes were not stamped on 1967 Corvette master cylinders:

https://www.corvetteforum.com/forums/c1-and-c2-corvettes/4733238-date-code-on-master-cylinder-from-67-a.html

[KurtS]

The D1, etc is not a date code but a mold number.