This is an RK-Tek “cheater” head for a ski doo 800r motor. It is 14:1 compression head. When you buy these heads you need a core head to send them. If you buy this one you won’t need to send your head in as a core, and will have no down time. As you can see the head is in great shape, no issues or damage anywhere on the head. I’m selling it cause I sold the sled and pulled this off first. $250