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I believe the stock touring model 09-13 all ran the same cams. Do they have the same grind or lobs because the first three numbers are so different. On the Rushmores they have different replacement numbers than the 09-13. The Rushmores have only the last two digits different similar to the cvo models with the 255 cams.
there are differences for the twin cooled models, maybe you are thinking of that.
the controlled combustion chamber temps allow more cam and higher compression
with part numbers- the "old" system used the suffix to denote the year of introduction, then alphabetics to describe revisions.
the first digits would describe the place within the motorcycle the part is used, motor, drive, transmission, wheel etc.
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