What freon is in a 1984 Chevy 454?

A 1984 Chevy 454, like most vehicles from that era, likely used R-12 (Freon-12) in its air conditioning system. However, it's crucial to have a professional mechanic confirm this before attempting any work on the system. R-12 is no longer produced due to its ozone-depleting properties, and any repairs or recharging would require a suitable retrofit refrigerant and potentially modifications to the system.