I just got back home after a winter in the south, and am chomping at the bit to get back to work on my truck. It's a 53 chevy 3100 which I put a 1962 235 engine in. I'got it running well, but quickly discovered that the block is caked up with rust in all of the water passages. A lister on here recommended blowing it out by connecting a pressure washer to the block drain hole. I found a fitting for that and bought it. He stated that he blew the rust out and then ran evaporust as a coolant for a short period, and it has been fine since. That sound's great to me, but after thinking about it for a while, I'm wondering if it might be even better to pour evaporust into the block, through the temp sending unit hole prior to using the pressure washer. Do you think that it might soften up the rust enough that the pressure washer would do an even better job of cleaning it out. Then using evaporust as a coolant. I guess that I'm mostly concerned about cleaning our the passages at the rear of the block. Once I get it pretty well cleaned out, I'll remove the freeze plugs on the side to get it even better. I know that I'm perhaps being a little lazy here, but I really don't want to pull the engine / transmission, and all back out. It's all hooked up and working so nicely right now. Yes, I know that I should have checked into this before installing the engine. I feel stupid enough already without any lectures about that. Thanks folks for your help and thoughts.
