c20let gm head oil gallery repair

[wkd astra van]

hi to all i m from malta and i have a gm head that need reair.can anyone on here tell me how can i get this head as good as the coscast one,cause here in malta never anyone arranged one.the problem is that its my only head remaining and i need it urgent.can anyone explain to me even with pics.if someone want to contact me by e mail this is the link
chrisazz01@gmail.com
thanks to everyone that can help

[wkd astra van]

anyone can help please

[Rs1]

Have a look on here mate, on the left is a solid tube fix and a hollow tube fix....just click through and it shows you what to do.

http://www.orsas.com/CarStuff/cav/