| This listing is for a single new heater core for all 74-78 z's. Posted pic is of a 240 core, the 280 spigots are a different shape. We do have lots of good used ones in stock. Special order, please allow an extra week for delivery. If the core leaks in your z, then there will usually be visible coolant inside the heater box. You can usually see this by pulling one of the defroster ducts and looking inside the box with a flashlight. In more extreme leaks they will leak coolant out both sides of the heater box. If it is a valve or heater hose leaking then it will only leak on the passenger (right) side and it will be dry inside the heater box. Last update 01/12 | 
