Smog pump date code

**ALLZS** · #1 10-05-2022, 03:05 PM

I have a pump with 13881Z stamped on it is this a 68 pump also I have seen with a S at the end of the date code but not a Z

**X66 714** · #2 10-05-2022, 03:14 PM

I found this on CRG....Joe

The last digit is the configuration code of the pump. The 67 pumps are coded A and C. (67 Corvette pumps are coded P and are unique to that application.) The 68 pumps with a pressure relief valve installed in the pump were coded Y. Non-pressure relief valve 68 pumps were coded Z. 69 and later pumps (without a pressure relief valve) were coded S.

**ALLZS** · #3 10-05-2022, 04:59 PM

ok thanks so it looks like a 68 pump without the reliel valve, did a certain model use the with or with out on the valve

**X66 714** · #4 10-06-2022, 12:20 PM

This is also from CRG....Joe

The 68 pumps used on Z28's and big blocks had a pressure relief valve installed on the side of the pump. The Z28 relief valve has a green plastic plug and the 396 relief valve has a black plastic plug The 68 pumps for L6, 327, and 350 engines and all 69-and-later pumps did not have the pressure relief valve on the pump; it was incorporated into the diverter valve.

**ALLZS** · #5 10-07-2022, 12:22 AM

Good info thanks

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