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I'm e-mailing back and forth with a guy that has a 5464264 master cyl which the JG says is correct for my standard brake car. The JG says the casting date format is MDDY. The seller says his has - 206 X 1, with the -, X and 1 appearing to be made with different punches than the 206. I'm hoping someone can shed some light on this. Maybe this was not a new casting for the '64 model year Corvette and was previously used on earlier GM cars with a different casting date format? Thanks
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Re: '64 Master Cyl date code question
Check the archives as I remember a discussion concerning the "date" stamp on this particular master cylinder. It was determined that the 3 digit number is a julian date and the single digit was a casting mould #. The - and x are screw heads. There was no year designation....at least thats what was posted. Since mine and others in the discussion had the same format the JG might be inaccurate. -
Re: '64 Master Cyl date code question
John, Thanks. I did see that in the archives but there did not seem to be a clear conclusion that the JG was inaccurate. I was just hoping to get some later info. The part I was discussing turned out to be a power brake unit. I'd appreciate a lead from anyone as to where I might find one. I spoke to White Post with no luck.Comment
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Re: '64 Master Cyl date code question
My 64 master cylinder has the part number 5464264 on the bottom along the piston channel. On the bottom of the reservoir is a casting date with raised letters (i.e., not stamped, cast in) between two screw heads. My date has two numbers, "37", which I guess is either July of '63 (too late for my car) or March 7 of '63. There is a large "3" below the date which is sunken, I do not know whether this is a year code or what.Comment
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Re: '64 Master Cyl date code question
Oh yeah, I have power brakes also but it makes no diff since the master cylinder is the same.Comment
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Re: '64 Master Cyl date code question
John, The summary of what I've learned is that JG to the contrary, they appear to use a date code corresponding to the number of the day of the year. I've peresonally not run across anything that agrees with the JG. That would seem to be Day #37 in your case which was 2/6/63. That seems very early to me for parts that were not used until September, so the mystery continues. Incidentally, although both power and standard brakes used the same casting, they are different in that only the power brake part has the bleeder on top.Comment
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Re: '64 Master Cyl date code question
Thanks, Scott. I'd seen the note on the bleeder but I'd forgotten that trivia. My '64 is a power brake vette (with bleeder screw) made in June of 64.Comment
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Re: '64 Master Cyl date code question
Now that I think about it, since the year of manufacture doesn't seem to show up anywhere, yours could have just as well been made on the 37th day of '64 which would make it correct.Comment
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