I had to replace all 3 stud bolts on the exhaust manifold, the threads were not salvageable. Well of course over time the studs had pretty much welded themselves in and after trying many options, the only one left to was to drill them out. Managed to get as close to center of each that I could and after almost a day of step drilling, finally had daylight all the way through. I had gotten new studs from moss which are 3/8 unc (16 thread count) so cleaned the hole with a 5/16 bit to re-tap. It was one of those ahaa moments when you think ok, finally getting somewhere BUT apparently the holes are a teeny tiny bit out of round and two of the studs are a bit wobbly and I'm not convinced they are getting a strong enough bite.
What I would really like to do is fill the holes by welding and then redrill but I read where welding cast iron is tricky business.
Sorry for the long explanation to get to my question but since there are some threads that may create a good bite for jb weld what do ya think about smearing someof that in the holes then redrill? Wouldn't take much of it but do ya think the cycles of extreme heat and cool down would create problems?
What I would really like to do is fill the holes by welding and then redrill but I read where welding cast iron is tricky business.
Sorry for the long explanation to get to my question but since there are some threads that may create a good bite for jb weld what do ya think about smearing someof that in the holes then redrill? Wouldn't take much of it but do ya think the cycles of extreme heat and cool down would create problems?