Can someone tell me what engine this is please?

[keen 6]

Hi there I have 2800cc engine Im unable to locate year of manufacture and what cars its likely to have come from.

All I have is this number from the back of the head  BZ A 21710

Can someone help with id please?? Or tell me where any other numbers might be that I could use.

It is not in a car so cannot use body to help.

Edited September 6, 2020 by keen

[keen 6]

I have also found these numbers 32551643 with this number below it 286S1

[C-130 Hercules 571]

Post some pictures of it. 

[B.M.W Ltd 950]

49 minutes ago, keen said:

I have also found these numbers 32551643 with this number below it 286S1

https://www.google.com/search?q=bmw+286s1&rlz=1C1CHZL_enNZ752NZ752&oq=bmw+286S1&aqs=chrome.0.0l3.16890j0j7&sourceid=chrome&ie=UTF-8