here is a video of one of my modified Mach 427's..... engine always ran pretty good...but with the bumped up power didn't last overlly long till it wore out...8 minutes tops on our tracks
http://www.myvideo.de/watch/2834081/..._von_team_losi
here is a mod Werk's B5....now going strong at 8 gallons...14 minute runtimes
http://www.youtube.com/watch?v=F4i3lE3N4n0
absolutely no contest in engines...the Werk's flat out smokes the Mach in every way conceivable....