Chevy Chevrolet thermostat housing water neck GM date coded?

**RALLY** · #1 02-04-2023, 10:16 AM

Did Chevy cast code the thermostat housings? I see some on ebay that have a 1 above the part number, meaning 1971? Saw another that had a 2 above the cast part number, again were these date coded?

**jeffschevelle** · #2 02-06-2023, 04:14 AM

I would guess that's more likely a mold (or "Cavity") number. Hard to get much out of a single digit date code, so hard to imagine they would have gone to the trouble for that.

**AnthonyS** · #3 02-06-2023, 04:21 AM

^ I concur, I've never heard that these housings were dated either... and agree that it's not likely either. Cheers.

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