The big three worries with the M156 on display. My locking plates were in great shape with wear just starting to show. Pictured below are the worst of the lifters. Those ones had a grove that you could feel with a fingernail. Glad to have those out! The head bolts looked fine. Had I known their condition, I would have left them alone. I took pictures of the worst ones. Not bad for 14 years old and nearly 80k miles