Many apologies if this is a repeat- A search yielded no useable results.
I have posted to the NECO boards my 3L hybrid assembly process
here, and I believe that I have a potentially severe oil supply problem to the rear head.
At the bottom of the post, you'll see my 3L/2.5CSVT head comparison. I've numbered all of the corresponding passageways, noting the oil return hole that I had filled and planed by an aluminum welder. The issue comes in an unexpected form.
As you see in the comparison, there is an oil supply line under the hole marked "24" in the 3L head, but there is no corresponding receiver in the CSVT head. This by itself is an issue, but not a huge one, as I can turn the engine upside-down, tap & plug that hole in the block with a cap much like the ones that cover the oil feeds @ the back of the heads.
The problem is this- Is the passageway marked "3" the oil supply line for the SVT heads?
Also- The 3L head gasket has a VERY small hole in the spot marked "3". This won't allow enough oil into the head to pump up the lash adjusters and lubricate the cams? If I widen the hole, how much, and do I affect oil pressure and/or volume to the rest of the engine?
It appears the SVT heads only had this one "3" supply line. That supply line carries oil that has already been through the crank, and is thus substantially hotter than the oil supplied to the front head. Why the difference I wonder?