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I have a 309 master cylinder. The cast date is underneath the front loop that hold the cover on. When I look at this cast date from the driver side of hte car, it is the number 341 written upside down. I have never seen this on another master cylinder. This master cylinder has been on the car since the early 80's...

Any thoughts on why that number is upside down?

Thanks
 

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My original has an upside down 347. The brake booster and the steering box also have Julian dates on them as long as your looking in that area.
Doug
 

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Upside down date is common on the MC
 
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