I think novarossi make some of the higest quality engine bearings out there. I see so many people tune engines wrong and its hard to explane to most people that leaning an engine may not be the ancer to make any engine paform better. I know i have done it befor. What alot of people need to rember is all these engines are micro engine when you are tuneing them don't tune it like a holly 750 dubble pumper. You to do it in micro adjustments max 1/8th a turn at any time and do not try to get it in tune the first time you come into the pits and always start from a ritch setting always. It may take me 2 or more tanks to tune an engine corectly. But once thats done most people can not drive the cars as they have been losing power form incorect Tune. The best way to do it is you need a base line if posable get some one very exprenced to tune the engine just below its peak paformance. and watch and lisen thats the base line to work from. I hope this hepls some people I know it helped me when i was helped with info just like this. Regards Jeremy.