hamilton is a good name......
on a different note ....i'm from chiliwack. maybe i'v seen you or your truck? nice to see local guys with hot rod diesels :Cheer:
any valve manufacturer can make you what you want but youll need to know all the specs you need. ferrera, rev, manely ect...
I think that Garrett at PureDieselPower has a source for oversized valves, I don't know if they are over the ounter type stuff or not though. You might also want to give Greg Hogue (Comp461) a call, he has valvetrain stuff as well as can get his hands on oversized valves.
A lot of people, myself included will just run the factory intake valves on the exhaust for more flow on that side of the head.