AA design on the radiator does anyone know the weight comparison vs stock ?

 

I don't know the answer, but I trusted that GM would build the lightest, or close to lightest, cheapest to build, functional radiator possible. when I needed a radiator, the light , it's part plastic, functional, it works just like it was designed for the car, provided enough reasons to trip my buying triggers.. I couldn't do anything about the cheapest to build part of the deal , my old radiator cracked at the top plastic , but it lasted about nine years. That I can use plastic and save weight with reasonable durability is fine with me, because the part was not unusually expensive.

Why I even bothered to answer , without knowing the answer, is an attempt to give some functional general insight, it might give you enough information to form somewhat of a buying decision.

Because people making the choice to replace a stock radiator with aftermarket are usually making the choice because they have a motor that no longer has stock cooling requirements,

So, rather than duplicate the performance of a stock part, and try to make money selling that product against GM or dorman, most build for a market that is looking for extra cooling ability beyond stock, a market that won't buy plastic at the price point of aftermarket radiators, those radiators hold more coolant , use more tubes, and are all metal, so will absolutely be heavier. There is probably some guy building aftermarket radiators offering stock cooling, just made from better materials, because changing the operating temperatures away from the designed operating range is a big deal, but they can't be flying off the shelves.