Jon's 69 CST Build

[cornerstone]

I remember not that long ago, there was another forum member who had a similar experience... at a car show, left truck on display with hood up, came back to discover the check valve missing from booster. Later discovered the valve sitting on the battery. I think they assumed a thief pulled the part successfully, but got spooked and was afraid to go through with it so he set it down out of sight and walked away. Your scenario would explain it. I bet it happened before the guy parked the truck, and didn't notice it when he first raised the hood.

By the way, the new check valve looks great!