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Rob-----
I really don't know when the dating of the master cylinders started (or, possibly, ended). So, it's very hard to say what the origin of this master cylinder is. Given the very small number of J-56 Corvettes built in 1967, the chances that it was a PRODUCTION unit are quite small.
Just so there is no confusion, though, the dates that were present on Corvette master cylinders of this era were not casting dates. They were manufacturing assembly dates and are found stamped on the flat machined surface of the forward brake line fitting boss. They are quite small and lightly stamped. They could be easily removed if the machined surface was even lightly spot-faced.
Keep in mind, too, that it's not absolutely impossible that the unit is original to your car. As I mentioned, I've never seen one and GM production information does not indicate that any were used. But, that still does not mean that absolutely none were used. Although rare for components like a major brake system item, exceptions do occur. Unfortunately, if the unit is actually original to the car, I don't know how you could document it. This is one of those cases in which one may have to make his car "original" by making it "non-original".
If your car were an extremely late-build 1967, I think that might increase the possibility that the '346' was originally used. However, that still does not represent anything close to "documentation". Based upon what is known about 1967 master cylinders, the '346' is incorrect for your application. By the way, is the master cylinder coded "PG" on the front, machined surface and does it have bleeder valves?
I really don't know when the dating of the master cylinders started (or, possibly, ended). So, it's very hard to say what the origin of this master cylinder is. Given the very small number of J-56 Corvettes built in 1967, the chances that it was a PRODUCTION unit are quite small.
Just so there is no confusion, though, the dates that were present on Corvette master cylinders of this era were not casting dates. They were manufacturing assembly dates and are found stamped on the flat machined surface of the forward brake line fitting boss. They are quite small and lightly stamped. They could be easily removed if the machined surface was even lightly spot-faced.
Keep in mind, too, that it's not absolutely impossible that the unit is original to your car. As I mentioned, I've never seen one and GM production information does not indicate that any were used. But, that still does not mean that absolutely none were used. Although rare for components like a major brake system item, exceptions do occur. Unfortunately, if the unit is actually original to the car, I don't know how you could document it. This is one of those cases in which one may have to make his car "original" by making it "non-original".
If your car were an extremely late-build 1967, I think that might increase the possibility that the '346' was originally used. However, that still does not represent anything close to "documentation". Based upon what is known about 1967 master cylinders, the '346' is incorrect for your application. By the way, is the master cylinder coded "PG" on the front, machined surface and does it have bleeder valves?
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