5460346 Master Cylinder

[bc69]

Not sure. But this one is a early LOS.

[Mike S]

 Sure looks exactly like the 05B NOR 'WT'. The LOS has what looks like a skinner W. It makes me wonder if these were machined and stamped at more than one facility to account for the changes in fonts.  The few re-stamps I have seen have the wrong letter T (the top is not narrow)
 Is the part number casting upside down?


Mike

[bc69]

Yes I agree the suspected forged ones seem to have a wider font as you stated. Both letters. But seems same on height.
One out of bunch has raised a question in my mind on whether the pad was always milled before stamped. Is the basic pad shape cast or is it milled flat as most seem to suggest. One of the stamps looks as if it was stamped on a un-milled surface. Not pitted. ?

[Mike S]

 My thinking is it was milled flat but depending on the wear of the stone (I assume it is a stone of some sort) the pattern will vary as well as to the cut area.
The LOS machined area looks more to one side compared to the NOR cylinder.
And being the master cylinder came with a paint that wore off fast, that would leave the surface exposed to moisture over the decades to pit. Cylinders in engine compartments that developed a lot of grime (worn valve covers, power steering grime and air grime) probably fared better.

Mike

[bc69]

 ;)Well in my quest for a true WT, I have gained a wealth of knowledge on the subject. Still sure in my mind that there is a lot to learn and that I must proceed in this search with caution. The seemingly rare but reclusive WT is out there. But it is one you just have to stay in waiting and it will show itself. Once it does having to now use gained knowledge to decide whether it is a imposter or the true WT.  Then it seems that when one does surface, it has somehow in the past 49 years turned to gold. So.......the obsession, fascination, and compulsion to acquire a true WT goes on!  Lol!!!
 

[Mike S]

 The picture you posted, what was wrong with that 'WT'? It sounds like you have one already that has a good stamp.

Mike

[bc69]

None of these are mine mike. I have gathered these for comparison. The one I first ask about I'm looking at
But it's one of those that seems to be gold to the seller.

[jdv69z]

I'm assuming the master cylinders were supplied for Norwood or LA from the same source?

[bc69]

Gm used the delco moraine master on all to my l knowledge. I haven't researched that side of it yet.

[JohnZ]

I'm assuming the master cylinders were supplied for Norwood or LA from the same source?

Yup - Delco-Moraine Div., Dayton, Ohio was the source for all GM iron master cylinders in those days (except for a few supplied by Bendix).

[bc69]

Then John if one location for all, what's your thoughts on the stamping process. Different fonts or way each was stamped. And was the pad on all masters machined or have you seen any stamped on pad that had not been machined?

[JohnZ]

Then John if one location for all, what's your thoughts on the stamping process. Different fonts or way each was stamped. And was the pad on all masters machined or have you seen any stamped on pad that had not been machined?

The 346 master cylinder was also used on some C3 Corvettes, and I've never seen one that didn't have the front pad machined for the ID stamp. Delco-Moraine probably used the same gang-holder stamping process as was used on engines and transmissions, which would lead possibly to different fonts on different days.

[bc69]

What is the correct cap for the 67 WT?

[Petes L48]

What is the correct cap for the 67 WT?

Here's a thread you can read through from last year.  Apparently 67 to some point in 69 were all the same, then a second version appeared.

http://www.camaros.org/forum/index.php?topic=12201.0

[bc69]

Yeas thanks. I had seen that post. But most referring to 69.
And answer to my question not definite on 67.
Did they just use one cap on most all masters in each run or year?