-Also lastly notice the color differences between the three, the M52 cam is "bronzer" than the rest. This is prob caused by engine temps/oil choice between the motors and the fact that the bronze one was reciently run where as the other two have been sitting for a while

S52 camtrays

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S52 camspecs

-Note the TDC stamping differences on the cam block squares. The M52 is apart and the two S52s are together and offset to one side on both cams.

S52camshaft removal

-Part Number stamping is of absolutely no significance. The M52 intake cam and the new S52 intake cam both have the same part number stamped on them in the same place where as my old intake cam(S52) has a different number stamped elsewhere

-All three appear to be from the exact same casting IE no differences between the balance cutouts and the wrench flat section

S52camshafts in M52

Three cams shown. A used scored to hell M3 cam from my motor is on the left, a M52 cam from a customer motor is in the center, and a better condition cam i just purchased for another customers motor is on the right always...

-The stamping on the intake cam is in the same location for all three, but this time the two S52 part numbers match, including the letter("178F","890G","178F")

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So at my shop Im often swapping cams and such around and had an issue telling the difference between M52 and a set of S52 cams i had purchased from a motor. I did this comparison to verify that these were in fact S52 cams i had purchased to go into my customers motor.