Not if the marketing department wants to sell a cheaper line of engines and you don't want them to siphon sales from the better line. Now, consider the Norvel Big Mig 25. Hard to tell the power difference from the bearing model. Also, look at the OS LA 15. It is a well known screamer often out performing the competitors bearing models. Please note that OS has no bearing model in the 15 size so they are not competing with themselves and are free to use aggressive porting without hurting their own sales.