Will a CRF 450 09-12 cylinder head fit my 13?

According to MXA, Honda changed the following things on the 13' 450 that affects the head:
* exhaust valve size
* cam

While, you could swap the cam from your 13' to the 12' head, the exhaust valves will not swap over - you would have to buy 12' exhaust valves. On top of that, it would probably require a different ECU mapping, or the 12' ECU and cam with the smaller valves.

FROM MXA:

Q: WHAT DID HONDA CHANGE ON THE 2013 CRF450 ENGINE?

A: To the casual viewer the 2013 engine looks identical to the 2012, 2011, 2010 and 2009 engines. And, for the most part it is, but the 2013 mill did get five changes.

(1) Cam. The cam is new for 2013, but not really. The cam has the same profiles, but the timing of the cam has been changed by moving the cam sprocket for more overlap.

(2) Exhaust valves. The exhaust valves have been increased in diameter by 1mm (from 30mm to 31mm). Of course, the port shapes have been changed to work with the larger valves.

(3) Compression ratio. The compression ratio has been upped from 12:1 to 12.5:1 thanks to a a newly shaped dome on the piston.

(4) ECU. As is common practice, the mapping has been reconfigured for 2013?to focus more on low-to-mid power.

(5) Transmission. Although the gear ratios are the same as the previous four years, the gears have been beefed up for more durability.

Did you endup trying the 09-12' head out ?