Copper rads are very good. Had one in my old XR3i, Dartford Radiators made it for me. 3-row cooling and I asked for an extra 2 vertical braces as the original ones used to bow (something to do with not liking the crap cheap rads). Never had a problem with it. Got it in 1999 and sold it on the 2nd XR3i I had which I sold beginning of this year. Still like when it came out the box.

Let me know how much one would cost for a normal Sierra and I'd be VERY interested.