351 Winsor major overheating problem

[gofastmercury]

Well, I have a story, and I hope it helps. My friend had a F250 with a 460 that just would not be cool. We (he paid...) put in a recored rad, new waterpump, tried some fan things, pulled the heads and had them decked and pressure tested, flushed the block with the heads off ,and put in several thermostats and rad caps with no luck, it would run ok empty, but put a load on it, and it would boil over in a hurry, and would not cool ideling. I bought the truck after he gave up, took his 11.5 camper too. I tried a few things, it left me standed once, and while sitting on the side of the road, I thought, I bet there's something in the block, sure enough when I got home, I pulled the frost plugs and the right side of the block was filled with crap. Flushed it out, put in new plugs and nows its great! Finnally.