How is the master cylinder date code read? I have what I think is the original "PG" unit with "353" stamped on the front brake line attach boss. I assume this is the 353rd day of the year. Does this sound right? The car was built Jan 31/69.
-
-
Re: 69 master cylinder date code
I have found the dates stamped on the front brake line flange where the surface has been machined. 1-365 plus a 4th digit for the year. Are you sure that last digit is not an 8 instead of a 3? I am sure someone else can comment on this with better results. It is possible the last digit is a 3 then then it would read the 35 day of 1973? Like I said, someone else may know better. Terry -
Re: 69 master cylinder date code
I just had a closer look Terry and I can just make out a faint "8" after the "353". The machined surfaces are a bit pitted from rust but it can be made out. The "353" was punched quite deep for some reason compared to the last digit "8". Would you know of any punch sets that are the same size and style as was used for the "PG" and date code for these master cylinders? I would like to clean up these machined surfaces a bit and then use original style punches to bring out the original characters again. Thanks.Comment
-
Re: 69 master cylinder date code
I asked a similar question a few months ago. The net answer seemed to be that nobody is quite sure how the date codes were stamped/used. You can search the current archive for 'master cylinder date', or the link to the thread is below.
Thanks,
Jon
#10673
C3 Master Cylinder Date CodesComment
-
PG font is not standard
The font used for the "PG" letters is not a standard font type - the letters are about 1/3 narrower. The stamps on Muncie transmissions are also narrower than standard. About the only way to get around this is to contact the Hanson stamp and die company, they can "custom make" a stamp to match anything you want, but it'll be cheaper in the long run to just buy another date code correct master cylinder on e-bay (unless you're planning to stamp a bunch of them).Comment
-
Re: 69 master cylinder date code
I believe a company called "ALS" used to do it but they are no longer in business. I would try to find a new one. I believe you have a 353rd day of 1968 mastercylinder. Not that hard to find. Check out ebay. I would shoot for a date similar to your original. Restamping it would take considerable effort and money. Remill and restamp. Bucks and time and you may not be satisfied in the end. Good luck, TerryComment
-
Re: 69 master cylinder date code
I've been on the fence for a while trying to decide if I should send my original one out for resleeving but I think I'll look around for a bit to see if I can find a nice late 68 PG master cylinder before I make the call. I would rather use the one I have because it IS original but it would also be nice to have a nice clean PG stamp pad as well.Comment
-
Re: 69 master cylinder date code
They are out there. I heard the same cylinder was used in Jeep applications. I never confirmed this. You could call Mike at America's finest Corvette's. Be specific about what you want. Pay with VISA only and make sure he can send it NOW. He has a way of dragging things out. More than likely he has one. TerryComment
-
Re: 69 master cylinder date code
Greg-----
If you find one with a "nice clean PG stamp" it's probably not original. Most, if not all, originals were very lightly stamped as were the date codes. A savvy judge might "ding" you for a "prominent" stamping. If I were judging, I would. But, I don't do any judging so you don't have to worry about me.In Appreciation of John HinckleyComment
-
Re: 69 master cylinder date code
So Joe, how much of a deduct is a missing "PG" stamp worth anyways? You can tell that it is the original cylinder from the date code and after lightly cleaning the "PG" stamp to bare metal you really can't make much out of it. The "P" is gone but if you know that there should be a "G" there, it can be sort of seen. This one sure was lightly stamped! I guess what I really need help on deciding on is, should I look for a good cylinder with a clean stamp or should I just resleeve the one that I have and loose the point(s) and call it good? ....what you all do?Comment
-
Re: 69 master cylinder date code
Greg-----
I don't know what the point deduction might be. I'd leave the original master cylinder on the car. So, I'd have the one you have sleeved/rebuilt. Absolutely.In Appreciation of John HinckleyComment
-
Re: 69 master cylinder date code
Thanks again Joe.Comment
Comment