2003 yz450f head on a 2006 motor?

I have a 2003 yz450f motor. my buddy has an 2006 yz450f. he was wondering if it would fit and work? also what benifit would he get out of the head if it did work? I told him I didnt think it would fit but im not 100% sure.

Nope, the engine was completely redesigned for 06. The head won't fit.

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