Hello Everyone - Just found out That Bonneville Valves are indeed Nitrided. So if a shop grinds your valve stems where they come out at the valve guides. They are ruined cause the Nitrided Metal is ground off . This is what happened to me on new factory valves I bought to put in my Americas head. They won't own up to it though even though can see rough grind marks on stem while before and after ground area stem is polished super smooth. So now I gotta buy whole new set. The shop ordered the new valves from a Triumph dealer and it took 2 weeks to get to arrive so they could wreck them! Trying to just get my stuff back outta there!!
