Wondering if anybody has tried the 1" copper "slide thru" the original in coolant pipes under the car with good results? I've seen it done here on the forum and just wanted some feedback with regards to success rate? Removing the box and fab'ing new stainless pipes at this point isn't even an option for us. Rad hoses, water pump and aluminum rad (with dual 10" fans) will be new and installed but I'm just curious if the lesser reduction in the diameter of the new copper coolant pipes will cause it to overheat? I'm guessing the originals are 1 1/4" so 1" is a considerable drop in size? This would be a more reasonable task for us compared to drilling out all the spot welds. I'm aware that this isn't textbook but I'm finding that I'm more and more impressed with a lot of the things guys do here that many in the automotive world would feel is less than ideal anyway? Some of this stuff is ingenious.