^Yea your right, JB is pretty good stuff and very useful for some instances, but not the best for tapping threads into, expecially when you can MIG/TIG weld it and tap it for $50. It depends on how much you have to use too, re-forming half of the bolt hole, the length of the bolt, isn't really going to work very good. You can do a lot of things with JB weld, my friend who use to run in the "claimer" series in dirt races, JB welded a motor that was cracked half way down--quite impressive. It only had to last one race though. JB weld isn't usually a long term fix, unless it's a not stress point.
But anyway, I have it done. Welded,nd and tapped out, but still leaking--think it's just the gasket--just made a paper one. I am looking into getting a better gasket or something and checking the smoothness of the gasket surface. I am in need of some of that "Dead Soft" aluminum material, but don't know where to get a little sheet of it. I might just have to order some Mr. Gasket (not sure what it's made from) from SummitRacing.
I am considering RTV sealant on the cover and all the bolts also, or at least till I get that dead soft aluminum to make a gasket. Anyone have any other suggestions??