RS4LOLA: I am also running the RR12L3....It has something to be said about it. I pulled it apart after 2+ gallons and replaced the Rod, I had stretched it and cracked the barilium bushing and it was running "SICK". I blew the 2 speed hub "actualy snapped the ring" from the back side of the gear. I have pictures to prove it and the parts too. This motor is crazy, tunes easy and out-runs most other motors. (I just need some more track time and learn to drive better) Even at the long back strait of Kissimmee, it pulls away (or catches) just about everything. ONE THING, CHANGE THE CONNECTING ROD!!!! It is now stronger than it was before,