same cylinders used on ac open mod motor( the bottom end of the 700 ie f7, same as ac snox motor is. It's plenty strong just like the 800 is able to go 900 and the stroke is fine for a 800) with d and d porting. Since they are new jugs it will be more expensive then bored out but should be more reliable. Bored out is not the way to go with big bores new designed bigger cylinders or bigger sled from the start. If it is in the same ball park as there 720 kits it will be $2800 and up depending what you want done.
A forum community dedicated to snowmobile owners and enthusiasts. Come join the discussion about performance, trails, riding tips, modifications, classifieds, accessories, troubleshooting, maintenance, and more!