Thanks for your thoughts. Love your boat, is Tonto at Chief now? I saw a beautiful Apache in there about two weeks ago.....only saw the front so couldn't see the paint scheme in the rear....was that Tonto? I plan on doing most of my running between 3,500-4,000 rpm........hope I can get that many hours out of them. Did you go solid lifters? These engines have solid lifters. I'll detune them after a few months time.