426 head fit 450?

Looking for a head for an 04 yz 450 and so far have come up short. But i found an 02 426 cheap that bottom end is out of. Will the topend interchange?

No.

Thank you sir. What years should I look for?

'03-'05 YZ450 (direct fit)

 

'03-'06 WR450 (may require blocking off air injection ports)

 

'06-'08 YFZ450 quad (same as WR)

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