You don't reckon that came off my vdub do ya?
What is the displacement of that bad boy? One cylinder diesel bunny? Oh turbo for sure.
What did that fall out of? Napier Deltic?
I think I found the valve that matches that piston..........in the housewares section at Value Village. Actually, it's for an even larger engine. The head is about 4" in dia, and the stem is about 14". Unfortunately I don't have a pic or I would post it. I currently have it in my living room as a conversation piece!
What did that fall out of? Napier Deltic? 
I wonder if anybody else on the list knows what a Napier Deltic is? Besides very cool. I read once that mine tenders ran stainless (non magnetic) Deltics during WW2.