Damn it. you got me, I was too quick and did not read :p Maybe he did a SOHC swap that we are not aware of heh.http://www.raceeng.com/p-4089-neona420-dohc-comp-plus305mmex.aspxhttp://www.raceeng.com/p-4090-neona420-dohc-comp-plus3475mmi.aspxEDIT: those links are O/S valves, but I am sure you can call and get STD size.Regardless I have SI valves installed in my new head.
---2012 2500HD LML