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Can someone verify the part no. for this- is 5480346 correct? My books say so, but a vendor is telling me different. Oh, and technically speaking, anyone got an extra? THANKS
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Re: '71 P/B Master Cylinder
Who ya gonna believe, Charlie?...the 70-72 TIM&JG or a vendor?
Actually, it's possible that both are right: Maybe 5480346 is the casting no.?,...and 5461184 the part no.? I have a hunch this may be where the confusion is between your book and your vendor; casting numbers and part numbers are not necessarily the same. It's the casting number that is important on the judging field, and 5480346 is the one the judges are looking for.
BTW, after working with vendors awhile, you will find there are those that know their stuff, and there are those that are, er... running a bluff regarding their Corvette knowledge. -
Re: '71 P/B Master Cylinder
Charlie----
Chuck described the situation with casting numbers and part numbers. The 5480346 CASTING is (usually) a 1-1/8" bore master cylinder. It was used on 1967 Corvettes with J-56 and most 1968-76 Corvettes with power brakes. It may even have been used after 1976. It was also used for some non-Corvette applications for Chevrolet passenger cars, Chevelles and Camaros. In some of these applications it may have been used as a 1" finished bore size. In any event, the Corvette applications of this master cylinder are usually identified by a "PG" stamping on the forward machined area or elsewhere on the master cylinder casting. Besides the issue of "correctness", the "PG" stamping identifies a master cylinder configured for the Corvette application.
The 5480346 casting was fitted with bleeder screws from 1967 to about 1973. After 1973 the bleeder screws were deleted from the finished master cylinders.In Appreciation of John HinckleyComment
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Re: '71 P/B Master Cylinder
Chuck and Joe-I am talking about the "casting" number-5480346. A couple of others have told me that there is a master cylinder with the same casting number, except the third digit is a "6". Could it be it just looks like a 6? Anyway, Joe, the TIM/JG says that "PG" is for power brakes, and "DC" for manual. Isn't the bore different between the two? Thanks again.Comment
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Re: '71 P/B Master Cylinder
Charlie-----
With casting numbers there is much confusion between many digits, especially "3", "6", "8", and "9". I believe that the casting number for this master cylinder is 5480346 but I've also seen it reported as 5460346. We usually refer to it as the "346" and avoid any reference to the third digit. I have several of these [none for sale] and when I get a chance I'll study the casting numbers with a magnifying glass.
The 1967 standard brake AND J-50 power brake master cylinder was coded "DC". However, this master cylinder is a 1" bore master cylinder and carries casting #5455509. It was also used for manual brake 68-76 Corvettes.In Appreciation of John HinckleyComment
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Correction
In years past I used to believe that the casting number for this master cylinder was 5460346. Then, someone convinced me that I was wrong and the number was actually 5480346. Well, now I've researched this a bit further and I'm convinced that I was right in the first place----the number is 5460346. I won't be talked out of that belief again!In Appreciation of John HinckleyComment
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Re: Correction
About 10 years ago we printed the blue prints for the master cylinder (I can not now recall if it was one or both) in The Restorer. By now Colvin might have them in his “Chevrolet/Corvette by the numbers” series as well. That ought to settle the issueTerryComment
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Re: Correction
Terry-----
Master cylinders are not covered in Alan Colvin's books. Do you know which issue of the Restorer it was in?In Appreciation of John HinckleyComment
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Sorry
My apologies. The print is not where I thought it should be - I must have been mistaken in thinking it was printed in The Restorer. Now all I have to do is remember where I saw the print.TerryComment
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Re: Sorry
Terry-----
I'd love to see it if you can find it.In Appreciation of John HinckleyComment
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Re: Sorry
Joe,
Hans Norberg had it when he did the 1990 story on master cylinders that did appear in The Restorer. My first thought was that it was printed in that story, but a check of the back issues proved me wrong. Now I just have to remember if he just showed it to me, or gave me a copy. I've checked my files without success, but there are some other options. If I can locate it I should print it in the magazine so we all can have it. You will be on the distribution list if I do locate it.TerryComment
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