cast iron thermostat housing

[Vitamin c]

Anyone know where this cast iron thermostat housing comes from? all ive seen are the cast aluminum. This has the number 5063 stamped into the side.

 

[jefflock]

I purchased a cast iron one from my local Bumper to Bumper parts store. It was cast in China and was really really rough. I smoothed it up with my 3" right angle air grinder before installing it. I was tired of the chrome one leaking every time I turned around.