Autotemp Heater Core. Part H6277. See pic.
1971-89 GM B & C Body full size model heater core Murray # 279101 Everco # H2271
Autotemp Heater Valve H4933
Autotemp Heater Valve H6325
Autotemp Heater Valve H2981
Autotemp Heater Control Valve H6327
