Pulled my radiator last night and noticed it was a Blackstone but not aluminum. My car is #257 and the radiator shop has not seen one of these ...gee haven't we heard this before LOL  Is it possible the early ones were copper? The production tag on the rad shows 3-89 and it's the original one. Go figure.

Mines a '90 and the radiator is brass. At least that what the guy at the radiator shop told me.

Who said they were aluminum?

they are all a copper brass mix.