I getting ready to tear into my 426 to freshen up the topend in to the bike I dont how many hours are on the topend or bottem end I a the 3rd ownner. I was thinking about a 444 big bore kit what I dont like about it you cant over bore the cylinder again if something go's wrong down the road. Is a High compressin piston worth it with the stock bore. I want to have a good port job done on the head from a good know shop. I already have hot cams in the motor I going to reuse so what kind of power should I get out of the bike. I put a new cam chain when I installed the hot cams in the motor about 10 runing hours ago. The bike has SS valves in it already the year 2000 came with them I have them checked and have the vavle seats lapped but they seem fine.