Yea I have the O.S. .21 TM on mine.
I don't have it in my revo crawler yet. I have Summit locker diffs I want to put in as well. need to modify the chassis a bit to get them to work. going to be a project for next month. Right now I am working on my revo 3.3 speed runner.
Speed runner link...
I have a few revos now. I just bought the
LRP ZR.32X .32 Spec 4.1 Monster Truck Nitro Engine
from here:
https://www.amainhobbies.com/lrp-zr.32x-.32-spec-4.1-monster-truck-nitro-engine-lrp32826/p1391509
Features:
Big Block size - You cannot replace displacement with anything… but even more...