Mine is 60mm at the flange, approx 55mm at the drive face as the flanges are approx 2mm high.
Sooo... FWIW... my ALT will be spinning much faster the yours.
Is your pulley the same dia pulley it was supplied with for a TD42 or did you reduce it for the 6.5?
The other variable would be the dia of the crank pulley which is what determines belt speed but IMHO as there are other accessories all driven by the belt like A/C, P/S etc you would think the belt speed should be similar between 3 belt and serpy
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