How to identify a coscast head?

[shrtwrec20]

Can anyone tell me how to identify a coscast head for a C20let?
And also where can I find the engine number?

I can only see a GM stamp on the head and where I thought the engine number would be, like it was on my e16se, the head gasket covers this area?

Thanks guys

[Pistol Pete]

Engine number is on the block, down the flange where the gearbox mounts. At the front.

Coscasts have "COSCAST" in between 2 of the exhaust ports. Need the head upside down to see this though. Also, core plug in the side. IIRC the Coscast doesnt have one.

See here for info...http://www.max-boost.co.uk/max-boost/internet_articles/Astra-mk2_com%20-%2020XE%20Coscast%20Cylinder%20head%20dossier.htm

[davidfox280585]

as above coscast under the number 3 exhaust port feel for it you will feel it and if it has a core plug on the gearbox side then its gm coscasts are blank

[Mark]

http://img.photobucket.com/albums/v11/CorsaNova/Others/b0088dq.jpg

[shrtwrec20]

Thanks guys. Much appreciated