I am an Allis collector and my dad and i have some gas engines .Dad bought a Meco engine cheap cause the head was broke out from freezing. He wasn't concerned about this cause he has welded up heads before. Except, when he got it home and looked at it closer , found that the whole bottom of the water jacket under the cylinder is busted out too and most of the pieces are missing.Major repair.I can weld, and i,m gonna try to fix it . I'm not an expert on cast iron welding, but i know there is preheating involved. I saw an ad in a magazine about those magna 770 rods , I think they were called. Sounds like they simplify welding cast,and sound almost too good to be true. Since they are very expensive, I wanted to see if anybody out there has tried them and what kind of luck you had with them? I thank you in advance for any responses.