Straw,
If he was actually showing him the compression gauge while cranking, I would say "yes", but trying to start the rig with the plugs out to demonstrate the "damage" wouldn't seem right.

JD


88 Pickup,4x4, 2.6 L, AMC head, K&N Air filter, Aisin Hubs, Redline Oils everywhere, 94 Trooper wheels.