I've had my radiator blow once, but thats cause it had a hole in it. The Hot light came on on my panel and a pulled over and it was just steaming out of it.
But i've always been afraid to go long distances in my truck during the summer. The farthest i go at highway speeds is about 10 minutes at a constant 65 mph. I'm just wondering, how long have you guys pushed your 60's straight sixes?