Well, it ain't that simple. What I see is a knurled guide. The rest I can see are factory stock, and someone BEAT the valve out of it and cracked the guide.
All the guides should be replaced with .500 O.D. hardened guides. Then, the top of th guide should be machined for a POSITVE seal and trimmed for height.
For all this, you need a quality seat and guide machine.
