So I bought my 450 used a couple of years ago and I've had an hour meter on since day 1 of ownership. I'm approaching 100 hours that I've put on it. Problem is I have no idea how many hours the previous owner put on it so I have no accurate, actual hour count. What I'm wondering is when it comes time for the valves to be redone where would I send the head? As of now the valves are in spec and they haven't been shimmed. So I still have some time, but I just wanna have a plan in place when that time comes. Thanks.