1978 280Z What is the allen wrench size for those bolts and what do they have to be retorqued to when reassembling. ALSO, what can be done for easy removal of exhaust manifold studs that broke at the Y-pipe connection. Anyone happen to know how hot that manifold gets when in operation, because I found some hi-temp paint that claims 1500 degrees if you bake it on for an hour at 650 degrees.