I just got my new valve springs for my cl350, making moves to replace the valves and all within the next few days. I ordered the valves and guides months ago because I knew the valves were damaged, but I wasn't sure about the state of the valve guides- just bought them cos I thought it'd be a good idea to replace both at the same time. But after reading about valve guide replacement I'm a little nervous about whacking out the old ones without the proper tool, so if I don't have to replace them that'd b cool. If I measure the inner diameter of the old valves and they're to spec, is it worth keeping them in? Is there anything else I can check to see if the old ones are still good? Or is replacing the valve guides not as scary as it seems? I've read a few threads here about valve guide replacement, but is there a best way to do it (without the valve guide remover/installed tool mentioned in the manual)?