Me and my friend both have Losi 8ight T RTRS with Mach 427s in them and they rip. Neither of us are running anywhere near lean and we get decent power from them. It's funny how we see guys trying to start their engines for sooo long and keeping them running. One quick push of a button and reerrrr it's running and not dying out
We ran these things in brutal conditions as well and they still performed great(0 degree weather and colder). We didn't even have any problems with cold starts either. I'll admit I get smoked on the straights by the higher end mills but through the turns is where I catch up and pass as the "fast" guys make errors and need a marshall [:'(] If you're looking for a good entry level engine get a Mach 427 and then just worry about your driving before you decide on getting an expensive and powerful engine.