The head and water pump have already been removed, and I was able to flush lots of rust out of the block that way. Used pipe cleaners, coat hangers, degreasers, acid, etc. but cant get the bottom hole in back of block to open up. Wasnt having any overheat problems before, but have engine all opened up for new cam and lifters, and freshed head and will be putting newly re cored (3 row) radiator back in. Trying to do all the preventative maintenance I can before buttoning everything back up. I'll play with it some more this afternoon.
