I remember calling Dubby when CRAIGHIMSELF and I replaced my radiator. Nothing happened after loosening the bleed screw, so we just let it run for 10 more minutes like that. No problems so far.

I was also wondering where you could get those metal-tanked radiators. Mine is an OEM replacement from C&R I believe... Anyway, it's still plastic. I'm pretty sure it'll last a while, but I'd like to know where to get better ones.