QUOTE(bellracing2 @ Feb 22 2008, 03:26 PM)

will the mounts have to be changed , will everything clear and be a bolt in ? any problems I might run into ?
You are not going to gain much with a 600 BB. I have a 98 XC 6 & a 98 XCR 440 and they run very close. 600 SB or 700 BB might be worth the trouble.