I just bought the big block conversion kit for the REVO. i tried to mound the Orion Wasp .28, and the pullstarter gets in the way. it hits the left-rear a-arm. the clutchbell was too far forward and hit the servo box. this dissapointed me because on the websites that i went to, it said that the engine could be mounted with "minor adjustments". these minor adjustments include getting a smaller flywheel, because it rubs on the chassis, and i'm not sure of what else.