I have replaced a stud in a cast iron exhaust manifold, but as luck would have it, one of the studs that I had to drill out, resulted in a oval hole instead of round. I have replaced the stud, but now want to fill the area around the stud with something that will withstand the heat. I was thinking of melting aluminum or lead around the stud. I don't really want to braze it, as I don't want to heat stress the metal in this area. Any suggestions?? Would brazing heat be too hot for the cast metal? I know it won't melt it..just don't want to cause a crack to form by stressing it in that area. Cold weld stuff won't handle the heat in this area. I guess the running temp in this area will be in the 800 degree range.
Thanks