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Username Post: 69 Z master cyl.        (Topic#368331)
J C 
Senior Member
Posts: 587

Loc: Orange Co. Calif
Reg: 04-17-04
05-03-22 04:19 PM - Post#2840651    

I changed out my master cyl years ago but kept the one I removed. I have no idea if it is original or if the same cyl was put in many other models. The only numbers on the cyl are 5468309. The only other markings is a small raised circle before the numbers with the raised areas at the 3 & 9 o'clock areas removed. Any info on this part is appreciated.

69RSZ28 71 Chevelle 79 Silverado 24K mi.


Frequent Contributor
Posts: 1286

Loc: Orlando Florida
Reg: 07-09-18
05-18-22 02:48 AM - Post#2841399    
    In response to J C

On parts like this, they were never serialized to the vehicle so there is no way to know if it was original to the vehicle, or not.

The date code on the item will tell you if it is "date appropriate" for your vehicle. For instance, a vehicle built in the 20th week of the model year wouldn't have parts that were cast later in the model year, but wouldn't have parts cast from much earlier (likely) either.


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