I have had a few RBs. I had 2 S7's one was an ab mods I got 13 gallons on and sold it to a friend, other was stock and got 15 gallons before a piece of the piston skirt broke off and scared up everything inside. I have a c5 with 12 gallons and another I bought used for $50 with an unknown amount that both still run strong. I have a RB mods C6 that has 9 gallons, I just put new bearings, turbo head, and con rod that still runs strong as hell. Got a short vid of when I tested it out so you can see how strong it runs. Rb's quality is great, every one I have had has lasted forever and been a breeze to tune.

Understand that I wasn't putting a race tune on the mill in the video. After putting new bearings and con rod I raise the idle so it can idle a tank at temps before I run it. After that I give it a hard run just to make sure it runs good. Ending temp was 220 running O'donnells 30% and medium plug. Only reason I took the video was I got a new palm phone that uploads directly to youtube and wanted to test it out. What sounds like a lean motor is acctually the idle gap to big from when I let it set for a tank and lowspeed was a little rich.

http://www.youtube.com/watch?v=aeTyiUFlwPI