[Bill Edgeworth]

As Jeff stated the rule book is real clear. It has to be same as OEM design.
However I wonder if this rule will need to be revisited in the future. I know for my Firebird it comes OEM with a brass tank radiator however I now notice most of the replacements out there are going to plastic tank with aluminum core. Now, I have never weighed one verses the other and I would assume the plastic/aluminum one is way lighter. But don’t the aluminum cores hold more water? Is there still a big difference when they are filled?
Myself, I don’t know. I’m sure somebody out there has researched this and perhaps would like to speak up on the difference in their particular application.
I think in the coming years if the rule does not change to allow the Plastic/aluminum OEM replacements people will have to start spending money on having old rad’s repaired rather than buying cheap aftermarket replacements. I’m assuming brass tank replacement radiators are going to become a thing of the past in coming years
Just another can of worms.