I have been told that the titanium valves will not handle the heat. I guess it all depends on the tune up. I've heard of people running stainless valves. I run the iconell/super alloy stuff in mine.
Bummer. I hate to use anything other than titanium because the valves in these Profiler heads are so long they are going to be heavy!! Oh well, we'll give the inconel a shot.
Inconel valves here as well. It's worth it for all the heat they're going to see. The titanium stuff has been tried by a few people. Not sure how well or how long they hold up.
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