Originally Posted by JayBo1
I take my hat off to you John
. By including the bit about "first hand experience" you have cut off 99.5% of the responses you were going get
I'll dig out some details for you, but rest assured there are a fair few differences between a 450 Rally motor and a SX-f motor. I have seen both close-up and personal, including the insides, but even better I know someone that has grafted a 450 Rally motor into an XC-f frame. (Actually it's for sale at the moment and I'll find a link to it for you). There are many considerations that the average punter that doesn't have the "hands on experience" wouldn't even think of.
You're not trying to sell my bike now, are you?