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Difference between 03 & 06 head

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Can anyone tell me the physical difference between a 03 & 06 head? I have a 05 and I'm looking to put a 06 on it to try and get away from the valve issues of 05. Long story but I was sent a head from a 06 and it has a hole on the right side which my 05 doesn't I then tried to put an ex valve from my 05 spares kit and it was to big to fit in the stem??? From what I can see of the parts fiche the hole has a cover (metal with a black circle) on it.

Have I been ripped off and sold a 02, 03 head? I can't find much info on it but it looks like the extra hole might be for the decomp arm/lever.

 

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No, the fiche shows that hole which was, if I recall correctly, there for a decompressor option on the early 450's.  Regardless, buy the bits needed if you don't have them as the only difference is the seat material between an 03 and 06 head. Same valves were used, cam, etc.

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