I just took in the head and the crankshaft so I can oversize my WC. When I got there, the guy at the machine shop said, and which I had noticed, that one of the antifreeze holes was clogged up. Never have had any problem of it heating up. It would just reach the cold-warm line and would not go over it, even when I pulled it or worked it continuously. My question is should I have the radiator flushed and cleaned? I don' want to take any chances, but is this normal, never seen it before.