Have a P/B MC part #5464264, bleeder on engine side, has a circle with lines through it and the letter D next,then the delco logo, on the lip of the reservoir is 1 0 4 with circle with slash through it on either side and another 4 under that, and 7/8 on top of the front casting. Is the D the month code or is 1 the month code? Is this correct for a June 16 car? Thank You Gary
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Re: 1964 Master Cylinder date code???
Gary-----
The "D" refers to the Danville, IL nodular iron foundry where many of the cast iron Delco brake parts were cast. The "104" with the screw heads on either side refers to the day of the year (i.e. the 104th day of the year). Often times, there is no reference to year on these castings. However, the "4" below the "104" on yours might well indicate 1964. If so, that would mean the 13th of April, 1964 which would be just about right for a June, 1964-built car.In Appreciation of John Hinckley -
Re: 1964 Master Cylinder date code???
Gary, Search the archives, there's been quite a bit posted about '64 master cylinder dates. The consensus is that the TIM & JG is not correct. Personally, I believe your MC could have been cast on either the 104th day of '63 (for a early '64) or the 104th day of '64 (for a later '64) and there is no way to tell which. I believe the 4 below the 104 is the cavity number because I have seen numbers other than 3 or 4 which rules out it being the year.Comment
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Re: 1964 Master Cylinder date code???
Gary, I have an early 64(Nov 63 build date) with same description as yours except has 206(July 25) in date area followed by the # 1, which obviously doesn't stand for 1961. Add to the mystery ??Comment
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Re: 1964 Master Cylinder date code???
Does anyone have a definite time period when date coding changed from alfa-numeric (ex: D2463) to Julian (ex: 114) at Danville. (OR at Tonawanda or Saginaw for that matter)??????
What's the latest alpha-numeric date coded cylinder case with a Flint or Tonawanda assembly stamp??? Perhaps it's time for a new thread, but I think it's time to nail down the change-over to the CFD castings. Once the Julians entered the picture, there's always a problem determining the year if the component is not part of a known original assembly, dated to the car.
I will offer my input: the latest Tonawanda alfa-numeric castings I've seen were late May '62. It would be very interesting to collate this. I apologize. Perhaps this topic should be a separate thread.....
VerneComment
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Re: 1964 Master Cylinder date code???
Verne----
I'm not familiar with any julian date coding system being used on blocks and cylinder heads. All that I've ever seen have been alpha-numeric, with the alpha character representing the month.
Julian dating, both of the casting as well as final assembly stampings, was commonly used for Delco chassis and brake parts. Many of these parts were cast at the Danville, IL foundry. My guess is that Danville was either following Delco drawing specs when it use the julian date coding or the julian date coding was SOP for Danville as well as for Delco chassis and brake.
I don't know that I've ever seen a component cast at Saginaw, Tonawanda, or Defiance, OH that used anything but the alpha-numeric system.
On the other hand, I can't think of any component cast at Danville that used the alpha-numeric system. There may have been some, but I can't think of any at the moment.In Appreciation of John HinckleyComment
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Re: 1964 Master Cylinder date code???
Joe,
I appreciate your input. I will pull together some examples and repost (perhaps under a new thread). Right now however I'm tied up with other unfortunate issues (see my revised profile).
I would really like to unclutter these casting issues. I'm not aware of a clear history. I think there's enough original evidence out there to pull it together. More field work and brainstorming needed.
VerneComment
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