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I've received the attached images from a BMW parts specialist who found it in New Old Stock (NOS).

It's a camshaft for an inline-6 but no Alpina parts number on the camshaft nor the box.
On the camshaft are a BMW logo and the number "23 04"

Any ideas?
 

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i think only buchloe can answer this one
 

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Looks like a M50 one. At the and were you have the quad for allignment tools, there are holes stamped in it. They need to be in seen on top, if the first 2 knocks are in 45 degree its exhast cam, if 315 degree its an intake cam.

I rebuilded a B10 4.0 V8 lately from broken distribution chain and I contacted Alpina. I could not see Alpina marks, only ori BMW marks on the camshaft. I asked them how to indentify, didn't get the answer from them. Hope you have better luck.
 

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If I am not mistaken the Alpina supplier of camshafts is Schleicher Fahrzeugteile in München. Schleicher Fahrzeugteile - Nockenwellen sind unser Geschäft

I have used this company as a supplier of sports and racing camshafts for motorcycles and automobiles since the 60´s. Their products are of top quality. They make camshafts for the german automobil industry like BMW, VW, Audi, Opel and more.

Schleicher has made the cams for my wifes B10 V8 but are not allowed to disclose any technical data nor selling camshafts directly to customers according to an agreement with Alpina. Ridiculous isn´t it?

Anyhow the cams in my wifes car are marked 624 (intake) and 625 (exhaust) and have a valve lift of almost exactly 10mm. Have only checked one side of the engine so probably the marking is different at the other side.

Ake
 

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If I am not mistaken the Alpina supplier of camshafts is Schleicher Fahrzeugteile in München. Schleicher Fahrzeugteile - Nockenwellen sind unser Geschäft

I have used this company as a supplier of sports and racing camshafts for motorcycles and automobiles since the 60´s. Their products are of top quality. They make camshafts for the german automobil industry like BMW, VW, Audi, Opel and more.

Schleicher has made the cams for my wifes B10 V8 but are not allowed to disclose any technical data nor selling camshafts directly to customers according to an agreement with Alpina. Ridiculous isn´t it?

Anyhow the cams in my wifes car are marked 624 (intake) and 625 (exhaust) and have a valve lift of almost exactly 10mm. Have only checked one side of the engine so probably the marking is different at the other side.

Ake
 

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If I am not mistaken the Alpina supplier of camshafts is Schleicher Fahrzeugteile in München. Schleicher Fahrzeugteile - Nockenwellen sind unser Geschäft

I have used this company as a supplier of sports and racing camshafts for motorcycles and automobiles since the 60´s. Their products are of top quality. They make camshafts for the german automobil industry like BMW, VW, Audi, Opel and more.
Nice info Ake! And welcome to the forum.

Schleicher has made the cams for my wifes B10 V8 but are not allowed to disclose any technical data nor selling camshafts directly to customers according to an agreement with Alpina. Ridiculous isn´t it?
Not at all. Alpina must have tested different cams and made an engine ecu calibration to meet emission with those camshafts (endurance testing, not cheap!) I think Alpina payed Schleicher tooling money to make the camshafts. In return the camshaft may only be sold by Alpina. I work in the turbocharger business and it goes the same way. We can or may not sell turbocharger our own if these cost are payed by the customer.

Anyhow the cams in my wifes car are marked 624 (intake) and 625 (exhaust) and have a valve lift of almost exactly 10mm. Have only checked one side of the engine so probably the marking is different at the other side.

Ake
I will check them one the car is in! Thanks for the info!
 
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