I have been restoring a 50 chevy 3100 truck. The truck does not have the original engine but a 400 sb and a aftermarket radiator. I think the preasure was to much for the orignal heater core When i looked down at the floor baord I noticed water streamng down. After taking the core out of the box I found that it has already been brazed before so the core is more then likely to rotted to mess with. Does anyone happen to know a vendor that sells new cores? The core i have is the round type. thanks ahead for any help