It just does, a lean mixture burns at a higher temp....But can you explain how it being lean will make it run hotter? I'll try making it richer before i drive tonight and see if that helps. Car has A/C also.
Don't think GM would have spent extra dollars for a 4 core on solid lifter engines or AC equiped cars if it didn't cool better. All thinks being equal, 3 core copper brass or 4 core copper brass, the 4 core should provide better cooling.I heard changing to a 3 core radiator will make the engine run cooler then using a 4 core radiator, because it restricts the air flow. I do not know if this is true.
I just took out my .060 over 327. The transcooler was mounted to the MIDDLE of the front of my radiator, but a few weeks back I moved it to the side (but still in clean air at cruise) and about 3" in front of the rad and it helped quite a bit. Your area is hotter generally, but I would get a bit nervous if it was up at 210-220 for long periods. Mine runs at 180-185 on the highway on a hot day. I don't have AC.The 4 core Radiator is new. While reading through some of the other postings something obvious just came to mind. I also am running a transcooler mounted in front of my radiator and as I read in other postings that might be contributing to increase in temperature.