What does casting info mean on Master Brake Cylinder

[Hans R.]

I have a 1965/1966 Master Brake Cylinder with some casting info on the left (outer) side, what does it mean?
Neither Judging Guide nor Nolan's Restoration Guide mention these figures. Please see enclosed picture.

On my 1966 Coupe I have a Master Brake Cylinder with no casting info on left side.

Are they both original pieces?

Ops, sorry for the rotated picture!

Hans Ryden
#868

[Joe L.]

Re: What does casting info mean on Master Brake Cylinder

I have a 1965/1966 Master Brake Cylinder with some casting info on the left (outer) side, what does it mean?
Neither Judging Guide nor Nolan's Restoration Guide mention these figures. Please see enclosed picture.

On my 1966 Coupe I have a Master Brake Cylinder with no casting info on left side.

Are they both original pieces?

Ops, sorry for the rotated picture!

Hans Ryden
#868

Hans-----

The "wagon wheel" symbol denotes the GM Central Casting Division which operated all GM foundries at the time. The "D" denotes the Danville, IL malleable iron foundry. The 2 likely represents the pattern number. I don't know what the "R" denotes.

I believe the 351 is some sort of date code. This style of date code was used for many of the castings produced at Danville. It may be a julian date code that omits reference to year or it may be some unknown date coding format.

[David H.]

Re: What does casting info mean on Master Brake Cylinder

.... I don't know what the "R" denotes. ....

"F" and "R" for front and rear brake line connections?

Dave

[Don H.]

Re: What does casting info mean on Master Brake Cylinder

Come on Dave, that's too simple...

[Dan A.]

Re: What does casting info mean on Master Brake Cylinder

Many years ago there was an unauthorized reproduction of the, 1965 and 1966 power brake master cylinder. An individual from Marengo OH had them made. They did not have the Julian date code like the one towards the rear in your photo. He also had an unauthorized '63 master cylinder.

[Kenneth B.]

Re: What does casting info mean on Master Brake Cylinder

JOE you are correct. There were many patterns on the plate that made the molds so each pattern had a #. Dat looks like a Julian date buy that is NOT typical of most foundry codes which was month day year.

[Gary B.]

[Joe L.]

Re: What does casting info mean on Master Brake Cylinder

JOE you are correct. There were many patterns on the plate that made the molds so each pattern had a #. Dat looks like a Julian date buy that is NOT typical of most foundry codes which was month day year.

Kenneth-------

I agree that most GM foundries used the date coding system of M-D-Y. However, for some unknown reason, the Danville foundry usually did things differently. I have seen the same system, whatever it was, used on other Danville castings.

[Joe L.]

Re: What does casting info mean on Master Brake Cylinder

Many years ago there was an unauthorized reproduction of the, 1965 and 1966 power brake master cylinder. An individual from Marengo OH had them made. They did not have the Julian date code like the one towards the rear in your photo. He also had an unauthorized '63 master cylinder.

Dan------


I think you are referring to a guy named Gentile. He did several brake system parts, including J-56 front brake caliper supports.

[Dan A.]

Re: What does casting info mean on Master Brake Cylinder

Since Bud is gone now and there is another GM recognized reproduction I wasn't sure i wanted to name names.

[Joe L.]

Re: What does casting info mean on Master Brake Cylinder

Bud Gentile, is it prudent to name names?

Dan------


I don't see why not. I see names of folks all the time here. Gentile passed away in 2009 at age 67. He was most famous for his 63-79 "HD" rear end covers.

[Dan A.]

Re: What does casting info mean on Master Brake Cylinder

Was he involved in litigation over the HD cover?

[Joe L.]

Re: What does casting info mean on Master Brake Cylinder

Was he involved in litigation over the HD cover?

Dan----


Not that I know of but it's possible. I think that piece has been off the market for a long time. It could be that it died with him, though.

[Hans R.]

Re: What does casting info mean on Master Brake Cylinder

With the information given in this tread, would that mean that the brake cylinder with casting information also on the outboard side, be an original piece. And the brake cylinder in my -66 Coupe with correct casting on the inboard side (DELCO MORAINE 5467084 1 DIA) but no casting info on the outboard side, be an old reproduction and not original?

Hans

[Dan A.]

Re: What does casting info mean on Master Brake Cylinder

Maybe. The current reproduction authorized as a GM Reproduction Parts has the debossed and embossed markings. There are subtle differences from originals. The first release of the current authorized reproduction does not have a date and the Delco logo was ground as they had not come to an agreement with GM Reproduction Parts at that time. Agreement was reached and thus the current line of reproduction master cylinders.

The very old not authorized reproduction as said has no definite markings on the outboard side. If it fails and a latent defect can be determined their may not be anyone to sue.