Hi all. I most certainly had sticky valves a few years ago when I bought a 60 Imperial and drove it with its stale gas !!! Boy did that teach me a lesson. It ran fine, but soon a couple of valves stuck and bent a few push rods. I thought I blew the engine !! I had to remove the heads and have them done. A totally unnecessary big job and expence. And it's easy to happen when we deal in old cars. '58 Plymouth - "Christine", '59 DeSoto, '60 Imperial cnvt, '60 Fury cnvt.