chemi-weld isnt dodgy shit at all! we use it in our race motors when we first run them in to make sure every thing seals. at 80k an engine we dont put dodgy shit in our engines but yes it can be used to prolong a leaking head gasket. you prob find its from the head as its been sitting dry for awhile and its alloy. just put the engine in and run it. if theres a prob im 100% sure jeff or joe will fix the problem.
mick