I had to do the head gasket on my tin top yesterday, When I was taking it all apart I started to remove the 2 grub screws in the spark plug area of the cylinder head. Didn't take them all the way out, as I soon realised that they don't need removing.

But my question is what are they for?

I think they are oil gallery blanking plugs

good job I left the in then.

Cheers