You really aren't too bright are you!!! I don't mind explaining something once or even twice but here goes for the about the 4th time..... The valve overlaps need to be independant so the ECU can change the overlap to optimize compression in any air or DA (density altitude) conditions. If you were always operating in the exact same enviroment I supose you could use one cam and just grind it for one condition. But this is the real world and if it's going to work right the 2 valvetrains need to be controlled seperately. Damn.... I hope you got it this time. If not I really don't care. McDonalds isn't oing to have you designing cars... Thank God! :?