So I have started to pull apart my R12 1289cc engine with the aim of putting in the "mild" cam from my parts 1.4l engine. Turns out the two camshafts are identical.

Now it is apart I might as well get one of them reground.

In my parts I have a head with the marking M17 whilst the original head is M8.
i looks aa though the face has been slimmed as the valve chamber recess is about 1mm shallower.
also the ports are smoother. The hot water pipe connection on top is at the opposite end.

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Any thoughts on what it is?

Ian