I think a big block might be overkill for a Revo depending on the type/size of the track you're running on and how the truck is set up. Been there done that and not sure I'm convinced a big block is the right way to do it. Normally I'd say go big or go home but in this case I'm thinking otherwise...I'm very excited to get out there and start racing my Revo next year along with my Losi, hopefully both will be Go powered. I'm really excited to try the .18 in mine...the stock 2.5R Traxxas motor and pipe works wonders in my Revo on a 100x175 track. I'm sure having the motor modded and changing the pipe/header would help out a little bit.