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They are out there right now, one is in use out of calgary and it is slowly comming into tune. lots of work and dyno time to get them set up properly. They are the kind of thing you dont want to get into unluss you are willing to spend lots of time tuning and working on fuel curves. there is...

You can contact hooper racing and get heads from him that he uses on his predator cyls. for the thundercat. You will need to cc your head find out the volume and then order a set in the same CCs, you may have to touch the stud holes with the next size bigger drill bit and it will fit better...

Only the very first year of the 800 cat had that taper then they went to a larger crank taper. But the p85 polaris clutch for the old 650, 700 and 800s were the same and were used a lot