How long does it take to replace heater core in 67 chevelle?

Replacing the heater core in a 1967 Chevelle typically takes about 4 to 6 hours, depending on your mechanical experience and the availability of tools. The process involves draining the coolant, removing the dashboard, and accessing the heater box to replace the core. If you're unfamiliar with the procedure, it may take longer. Proper preparation and having a service manual can help streamline the process.