I HAVE A 1967 BB W/J50 OPTION. THE CAST# IS 5455509 AS PER JUDGING MANUAL BUT THE CODE IN THE FRONT SEMI-CIRCLE IS "PG" (INDICATING J56) VS "DC". CAN THE 545509 CYLINDER HAVE "PG" IN IT AND BE CORRECT APPLICATION FOR J50? IF I AM READING THE MANUAL CORRECTLY THE "PG" SHOULD ONLY BE IN CYLINDER W/ CAST# 5480346. I, AS USUAL, AM CONFUSED.
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Re: C2 J50 MASTER CYLINDER CAST#
Joe-----
The GM casting #5455509 master cylinder is a 1" bore master cylinder. It was used for all 1967 applications EXCEPT J-56 which used a 1-1/8" bore master cylinder of casting #5480346. The 5455509 master cylinder was also used for 68-73 Corvette applications with manual brakes and the GM #5480346 was used for many 68-73 with power brakes, J-50 or J-56.
As far as I know, all 5455509 master cylinders USED IN CORVETTE APPLICATIONS were coded "DC" and this coding was unique to Corvette applications. However, the 5455509 casting may have been used for other GM applications, too.
Also, as far as I know, the GM #5480346 master cylinders USED IN CORVETTE APPLICATIONS were coded "PG", although the 5480346 master cylinder casting may also have been used in other GM applications. However, I believe that there was another master cylinder casting used for Corvette 1-1/8" bore master cylinder applications which also carried the "PG" coding. That master cylinder was GM #5466309. Although this master cylinder was not used for 1967 J-56 applications or any other 1967 application, it was used for many 68-73 applications with power brakes. Check to see if this might be the actual casting number of the master cylinder which you have. If so, it may have been a replacement master cylinder installed in your car in the past. Although incorrect in casting number, stamped coding, and bore size, there are many folks, including aftermarket/rebuilt brake parts catalogs/companies, which think that 1967 Corvettes with power brakes used a 1-1/8" bore size. Except for J-56 applications, they DID NOT.
Sometimes casting numbers are very difficult to discern accurately, so you may need to look very closely and, even, use a magnifying glass to discern the subtlties in numeral configuration. In any case, this is the only reason that I can figure that you would have a "PG" coded master cylinder other than a sheer mistake in stamping, which I doubt. That's because if it had been stamped incorrectly, then it would have been installed incorrectly and wouldn't have wound up originally installed on your application. Assembly line installers used the stamped broadcast code, or the more prominently displayed label derived from it, to identify master cylinders. They did not use the casting number.In Appreciation of John Hinckley -
Re: C2 J50 MASTER CYLINDER CAST#
Joe-----
The GM casting #5455509 master cylinder is a 1" bore master cylinder. It was used for all 1967 applications EXCEPT J-56 which used a 1-1/8" bore master cylinder of casting #5480346. The 5455509 master cylinder was also used for 68-73 Corvette applications with manual brakes and the GM #5480346 was used for many 68-73 with power brakes, J-50 or J-56.
As far as I know, all 5455509 master cylinders USED IN CORVETTE APPLICATIONS were coded "DC" and this coding was unique to Corvette applications. However, the 5455509 casting may have been used for other GM applications, too.
Also, as far as I know, the GM #5480346 master cylinders USED IN CORVETTE APPLICATIONS were coded "PG", although the 5480346 master cylinder casting may also have been used in other GM applications. However, I believe that there was another master cylinder casting used for Corvette 1-1/8" bore master cylinder applications which also carried the "PG" coding. That master cylinder was GM #5466309. Although this master cylinder was not used for 1967 J-56 applications or any other 1967 application, it was used for many 68-73 applications with power brakes. Check to see if this might be the actual casting number of the master cylinder which you have. If so, it may have been a replacement master cylinder installed in your car in the past. Although incorrect in casting number, stamped coding, and bore size, there are many folks, including aftermarket/rebuilt brake parts catalogs/companies, which think that 1967 Corvettes with power brakes used a 1-1/8" bore size. Except for J-56 applications, they DID NOT.
Sometimes casting numbers are very difficult to discern accurately, so you may need to look very closely and, even, use a magnifying glass to discern the subtlties in numeral configuration. In any case, this is the only reason that I can figure that you would have a "PG" coded master cylinder other than a sheer mistake in stamping, which I doubt. That's because if it had been stamped incorrectly, then it would have been installed incorrectly and wouldn't have wound up originally installed on your application. Assembly line installers used the stamped broadcast code, or the more prominently displayed label derived from it, to identify master cylinders. They did not use the casting number.In Appreciation of John HinckleyComment
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