I can't imagine a valve dropping down, riding the piston and not doing damage. You won't know what's up until you get in there. In any case, there was some problem the way the head was put together and you really don't want to keep running that way.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!