Help deciphering Pinto casting codes

[Roman]

I'm trying to identify the spec and original donor for the engine in my kit car.

The engine is in situ and I cannot see (or feel) an engine number stamped on the raised flat rectangular area (as would be expected).

The casting numbers are as follows:
205 (so obviously a later Pinto)
23F88
85HM6115BB (casting presumably designed in 1985)

Can anyone help me decode the latter two casting numbers?

It was fitted as a replacement unit in 1998 costing £350 but I don't know the registration or model of the donor though I suspect it was a 2.0 injected Sierra. I understand it has an unleaded head and 2.1 conversion. I assume this is using 2.8 Cologne pistons.and standard injection head from a 2.0i Sierra - which would explain the £350 cost

It would be useful to know the standard specs and origin should I wish to further tune the unit (currently running a 4-2-1 tubular exhaust manifold and suitably jetted 38DGAS Weber but standard camshaft.

Thanks

Edited by Roman on Saturday 9th December 15:15

[Roman]

I'll post my own findings here for the benefit of others who may look to decipher these codes for themselves in future and happen upon this thread via a search engine:

23F88 - Means the block was cast on the 23rd of June 1988 (A=Jan, B-Feb etc). This would make this unit one of the last injection SOHC Pintos manufactured for the Sierra before being superseded by the DOHC engine.

This forum is a bit quiet for advice on the oily bits of old Fords!