Got a new Go/Dan HeatBuster 4-Core radiator part # 436016 today. It fits with the stock brackets, transmission lines, hoses etc are a perfect fit. A few questions. 1) the radiator came with a plastic plug in the petcock fitting, it looks like it could be used instead of the brass petcock from the old radiator. The brass one only threads in about a turn and then gets a lot of resistance. I think it is the right threads, but I am scared of messing up the threads in the radiator, so I havent turned it any further. So I got a new petcock from NAPA thinking maybe the threads on the old one are distorted, it only threads in about a turn also. Is this correct, should I just turn it hard ??? Or should I just use the plastic plug in it. Any body that has a GO/Dan radiator let me know what your experience has been. Also there is a problem with the stock shroud, it will need to be trimmed to fit flush up against the mounting brackets. If I just used longer bolts it would sit back about a half inch into the engine compartment. With a half inch gap along the top, and I think on the bottom. What should I do, trim it - or just see if it works with longer bolts ??? I really need to know what to do about the petcock.