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How to identify an AC-DELCO master cylinder?


gatyo

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Well, I heeded your advice and purchased an OEM master cylinder for my '97 STS. I found a reasonably good price at ac-direct.com, and it arrived yesterday. It came in an original, but opened box, and it looks every bit like the one in the car.

On the box it's printed: AC-DELCO 174-746, GM 18029759, and indeed these are the correct Part Nos. However, on the MC itself I cannot find either number. On the bottom of the cast aluminum cylinder in raised numerals is the number 18016548, which _looks_like_ a GM Part No. but GmPartsDirect cannot find it.

Just for sh** and giggles I read the number on the old MC and it was 18013248, very similar to the new No and also NOT in GmPartsDirect's database.

Possibilities:

1) The number cast onto the bottom of the MC is NOT the Part No. (then, what is it?)

2) Neither MCs are AC-DELCO.

3) ??

I'd appreciate any thoughts and/or pointers from y'all.

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