[Healeys] 100 cam identification

[Michael Salter]

I'm trying to identify a 100 camshaft prior to purchase.
This cam, which appears to be NOS and has 2 rings on the body between lobes
6 and 7 and has a lift of 0.310" at the cam.
I have a faint recollection that these 2 rings were used to identify "S"
and/or possibly "M" cams.
Anyone know?

M
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