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Which year heads are interchangeable with 2004 CRF 250R

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Helping a friend with his 04 CRF250R and we came up with a new complete top end ( o.e.m. head, valves, cam, etc.) for a good price. Seller said it was off a '07 and it would interchange   - any comments on this-what would the differences be ,port design, valve/spring/seat upgrades from the problematic '04 design? Tried calling a few Honda dealers but no one had info...any shops that specialize in CRF's that might be worth the call .

Thanx

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All heads through 2009 although the 2009 will require a 2009 style piston as the chamber is diferent

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new1ex.JPGold1in1.JPGThanx, Ron. Looked at new head (said it's was from a'07)- intake and exhaust port shapes much different ,especially exhaust...the exhaust on the 04 seems to have a  lot more flow and I can use thumb pressure to push the exhaust valves down! It has blue marker on ex. spring and blue marker on exhaust side of case and brown marker on intake springs and intake case side.

 

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don't let the size of a port convince you that it flows more its the shape of the port and the 07 herad is superior.

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