[tubman]

I agree with "flatheadmurre". The "Evaoporust" treatment helps, but I don't think it will do much with the compacted sand/debris problem. Once you get that stuff out, I think it does a good job. Also as he says, you need a super clean system for it to work properly. I did my '51 Merc engine 3 successive times with intervening flushes and it turned out quite well. I have posted these picture before, but I think they show what can be done with an engine in good condition.