If your '06 came off the line with spring loaded tensioners that would mean that it also came off the line with the smaller inner cam bearings. If an '07 OEM cam plate with the hydro tensioners replaced the original cam plate with spring loaded tensioners, conversion cams would have had to be installed as the early cams were not compatible with the later cam plates. The early cams were carried in the cam plate by roller/ball bearings but the later cams are carried in the parent material of the cam plate; outer cam journals are different sizes. The only way early cams could have been retained would have been via the installation of the SE Hybrid kit billet cam plate with tensioners, etc. Which cam plate is installed?
The only way you will know for sure will be to pull the cam cover, which you apparently have done, and you should be able to ID the cam set by the numbers stamped on the nose of the cam shaft.
The other explanation could be that your bike was manufactured late in the model year and the line had been setup for the next model year and your '06 benefitted from that change. I have seen '06 heads on '05 models that came off the line late in the model year.
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Exactly....... andrews makes "N" grind cams just for this setup. Thats what i did to mine