A friend of mine just spent a chunk of change on an OHV conversion for his banger. He got it installed, fired up, and water was running out his exhaust. When he tore it down last night, he found a hole in the exhaust port. My first thought was to sleeve it, with a thin sleeve sealed up by epoxy. I can't, however, find an epoxy that will withstand the high temps of the exhaust. Mike spent a chunk on this head, and now is looking at a 'cheap', quick fix, to be able to drive the car this summer. Any ideas?