I need to install a set of Hedman universal air injector tubes into a set of headers, which where not designed for air injection tubes. All I need to do, in order to install these injection tubes is drill the correct size hole into each of the eight header manifold tubes, insert the air injection tubes into the holes, and then tack weld them closed, so there will not be any leaks. The only problem is that I am not a good enough welder yet to weld them airtight without any leaks into that tight of a space. I was thinking of using JB-Weld instead because it would be easy to manipulate in a tight space, thus making the seal airtight. My question is: can JB-Weld handle the heat of a set of headers without distorting and contorting, and allowing the headers to leak over time?