Hi everyone, pleased my question got so many replies. Thanks.
Now just to get this right, Ford Cosworth engines came in a few different color styled cam covers, to nominate which particular breed of engine it is, but some of the colors can span a few different models, gets a bit complex but a basic breakdown would be, deep intake of breath.
RED TOP
Sierra RS Cosworth (204bhp). YBB
Sierra RS 500 Cosworth (224bhp). YBD
Sierra Saphire R/Wheel drive (204bhp). YBB (same lump as first on list just diff body, hence same YBB)
Sierra Saphire 4x4 No Cat (224bhp). YBJ
GREEN TOP
Sierra Saphire 4x4 Cat (224bhp) YBG
BLUE TOP
Escort Big Turbo (227bhp) YBT
SILVER TOP
Escort `Lil Turbo (227bhp) YBP
Mines a Sierra Saphire 4x4 Cosworth Turbo No Cat (320bhp, played with it

Red Top YBJ.
There. I bet youve never heard so much Ford stuff on this site before. I apologize, please forgive.
Rhyd- kinda like that, but I think that `uns a 24V V6 Cossy (Cologne). But cheers anyway I was watching that vid the night before.
Mini kel- If you could find photos or any other info that would be ace.
But I take it from replies so far that this is potentially new territory.
Well, like I said thanks to all who`ve answered, I`ll keep checking back to see if anyone else can come up with ideas or info.
Regards
Scoob.