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CB750 Cams - Advise

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philward:
Advice and opinion please - I have 3 cams of which 2 profiles are the same and 1 is different. In the attached picture, the one on the left with a 'sharper profile' came out the K6 doner engine (which doesn't mean its a K6 cam!). The one on the right is from my parts bin and is of an unknown origin and has a rounder softer cam profile. Marks on L/H cam is marked R9 (and other similar cam not in the picture is marked  R11} . The RH cam is marked  C1 . Any guidance on what models they are from? The LH cam is in good order on the bearings and cam lobes - and within tolerance - but the cam shape seem 'sharp'. The other cams are not perfect. Obviously need to put the right cam in so any help appreciated.
Thanks

Trigger:
May be my eye sight at this time of night but, the one on the right doesn't look like a 750 sohc cam. No slot in the end ?
I will investigate tomorrow, could be F2 or K7/K8.

philward:
Just checked and your right Graham (as usual!) but the cam is defo a 750 based on dimensions, tacho drive, etc. I've done a bit of research on google images and it looks like the cam on the left that came out of the K6 is a K6. Which is good as its in good nick. Could the other RH cam (which has a worn cam lobe anyway) be an aftermarket cam - with having a rounder profile for a longer opening duration?

Trigger:
The one on the left is K6 and F1 ;) That is one chunky set of lobes on the right one ;D

philward:
Thanks Graham - tomorrow nights job to put it in

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