This is a view of an outer drive

Sometimes, if the client keeps driving an engine with a burned valve, the heat buildup in the valve head can get so hot that the valve head melts and breaks off. You are looking down the cylinder to the top of a piston that has met this untimely fate. Yes, that's a big hole in the middle..."stick a fork in it...she's done!".

Again, valve clearance adjustments can help prevent this from happening and save big dollars! Ask us.