Jon, Mark and I should get together and share a few tales. And annmil....Nothing wrong with your suggestion and its done all the time. Matter of fact, you adjust the valves on a hydraulic lifter Chevy with the engine running.....Most of us were bright enough to use a shield however. Most wrenches had a rocker cover with the center cut out for just that purpose. I still have one.

Our teens were constantly playing tricks on each other and their friends with my sauces. The hottest you will find BTW, is "Endorphin Rush" made by Dave of "Dave's Insanity Sauce." One night I found one of the guys showering at 3 AM. It seems a "joke" had backfired when he scratched his nuts without washing thoroughly first.

AND...............

There once was a couple named Kelly
Who went around belly to belly
Because in their haste
They used library paste
Instead of petroleum jelly

Spaw