How do you know if you have a good core?
Injection pumps - Cores will consist of items which appear undamaged, can have their drive rotated and are not rusty inside or out. While it may not be possible to know if the head and rotor are damaged, a seized head and rotor will not qualify as a good core. This is why we strongly suggest that the pump be known to operate (albeit possibly with some anomaly) prior to removal.
Injectors - Cores will appear intact, not be missing any tips or other parts, and if they are electrically operated, have intact wiring and plastic parts.
Turbochargers - Must be complete, and in most cases have exhaust and intake housings that are undamaged.
The above is a guide, and cannot be guaranteed to produce a usable core. Conestoga Diesel Injection, and it's partners reserve the right to determine the usability of a core and its value.