Hello bigtim; Here's a little tip, regarding your valve set. You can increase your valves stroke by reducing the valve clearance, also duration in increased. This tip is for Saito's; reduce your valve gap to .002, intake and exhaust, then re-tune it a bit rich, and be ready for a huge improvement. I don't know how well this will work on an OS, because I haven't personally tried it. I haven't seen any increased wear anywhere on the engiens I've done this to, as the barrel grows more then the connecting rod, valve clearances grow as an engine heats up. Try it!