NEW HEATER CORE FITS FRONT CHEVROLET 73-74 87-91 BLAZER 73-74 C10 PICKUP 73-86 C10 19131974 19131978 399077 94552 100% NEW and Made with the Highest Quality Components Available Full One Year Warranty Computer tested for consistent Quality and unsurpassed reliability HVAC Heater Core - Location: Front Core Size: 6 7/10" x 6 3/4" x 1 1/4" Inlet Size: 3/4" Diameter Outlet Size: 5/8" Diameter Source: Aftermarket