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What's with AZ in the title? I thought you might be here and was gonna recommend you bring the parts to the All Olds Show in Scottsdale on Saturday. It's the 30th annual show and should bring a lot of cars and people.

 

That's the code cast on the passenger side of the thermostat-housing port. You can see it in a couple of the photos.

 

I wish I was there. Below freezing in MN today

AZ is casting # passenger side front corner on both intakes. Both are Date code "83"