John; That looks like a nice conversion on your radio, the one in my '56 is still all AM, though a friend, a retired radio guy, completely redid it for me several years ago. Those readings don't look too bad considering the ambient temps. My car was something of a chronic overheater (I think due to the factory A/C) till I put a modern type high density core in it a few years ago, now with a switched rad fan it's nearly as good as a modern car (with a good cooling system that is!). I had the original rad recored a couple of years after I bought it in '76, but like I said, I always struggled with the engine temps till I re cored it again around 2000. Keith