Yea,I got them in my cub and powervalve shees,Allthow I'm only running the lockup on the cub,And my powervalve I'm running really stiff springswith hydraulic clutch system.Ben running tusk in my powervalve shee for a year now no problems.I'm pretty sure the horse power on both of my engines are up there(No proof on paper though)Only pucker factor. :beer: