Just thought I would throw this up for discussion.
Looking at drilling and tapping a hole for a remote oil feed for the vct on a 25/30 as it currently does not have one (internal vct mod doesn't work)
The head is currently on the engine and in car and was thinking of doing it in car.
The best strategy that i have come up with so far is:
drilling into head. grease covered drills and taps to catch the majority of the alloy and using compressed air from the other side of the drill location.
Not a real ethic way of doing things, but I am entirely open to ideas