Topic: oil orifices: where's the oil feed?

[grumpy]

I have a 750K3 head sitting here.
where is the oil feed for those little oil jets? I'm assuming it comes up from the main galley - but how?
I'm looking at the bottom of the head & I can't see an obvious opening / passage up to the top.
I know I have to be looking right at it...
 

[kmb69]

It comes up the 2 center, rear cylinder studs that have the O-rings.