Head swap

I'm workin on a friends 03 yz450f, it needs a new head. Can anyone tell me what years are compatible, I am getting conflicting information. I thought 03-05 heads fit, but my local dealer is saying the 05 is different.

It has a different part number, but the '05 fits. There was a change to the intake ports. Heads from an '03-'06 WR450 will also fit, but any of them from '05 on had air injection, so the ports for that have to be blocked.

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