text me numbers from the dyno and ill tell ya lol. If you have stock rods i would keep it bellow 8,500 but your not going to make power oast 8,000 rpms so doesnt matter . Nemos motor is the only one ive seen make power past 8,000 and thats because it had a h22 crank not h23 . Shift at 7,800-8,000 should give you the best times . if you wanted to try 8,200-8,300 to carry a gear out im sure that would be fine but anything higher then that is a waste of time not going to make power unless you have a hudge head and pro3s . Im still dont think with all the shit i have in my new set up the power will go past 8,200. Ill be estatic if it peaks over 8,000. Big motors normally peak lower . The good part about that is you can make alot of power and it be dependable. If you have to rev your motor to 10,000 to get power out of it odds are its not going to last long but hey they sound good lol.