Artefact identification

[ian]

its a BSA M 20 head gasket ?? i beg to differ but il not get ino it ,, its definately not a head gasket ,,its a high temp presure gasket of some sort ?? but not a head a head gasket ,, i admit it looks like a side valve single cylender ,, but i dont believe it is ,, it would be good to see it totaly flat ,to be sure
but im 99.9% its not a head gasket

cheers ian

[Tim D]

Thanks for the info I've flattened the gasket to see if that helps with the identification , could it be from an aero engine?
I've also taken a larger photo of the other artefact . It is made of aluminium and is hollow but feels well constructed .
Thanks Tim

[Gunny Hartmann]

Thanks for that, it does look like a side valve head gasket, i think the one i've posted is from a Norton but you can see they are roughly the same shape.