New OEM Yamaha head with the Kibblewhite Stainless Steel valve and spring converison kit from the original Titanium. We don't suggest this conversion for race use. Reduces power by 10%, has a greater chance of floating a valve and doesn't wear a lot better than titanium. Stainless valves are about 70% heavier than stock and require heavy duty springs. We do not guarantee stainless conversions. The good thing is that they are cheaper.