would the model 15 be better than the gen 5 animal in an open build, thinking of the faster motors model 15 with a sleeve and his piston with a flathead crank, I know some will say don't use the flathead crank, but I had bad luck with the ARC stroker cranks and im not paying $600 for a super alloy crank, I been running the flathead crank foe a while and not broke one YET.