Mystery M20B25 Head manufacturer

[HELLBM 1557]

Need help to try and identify the manufacturer of this M20B25 head.

Bigger ports than OEM and only has this marking stamped on it:

[MLM 57]

Kolbenschmidt?

http://www.elringparts.co.uk/products/kolbenschmidt/

[HELLBM 1557]

Thanks for that.

[BM WORLD 1283]

seam to remember there where new m20 heads being sold on trade me a while back , not a bmw part

[tomac 0]

Hello,

Thank you for your post. I've the very same head from Kolbenschmidt (now Kolbenschmidt KSPG).

I've the head off the engine for now to replace the valve seals. I was thinking about replacing the whole head by an original 885 with a porting job as I have a 2.8 stroker.

Now you are telling that the ports are bigger.

I've no reference to compare but it looks very much like the AMC casting (which flows less than the 885) so I'm not sure.

So maybe I should keep this head. Any further information ?

Thanks !