Thanks Ed_L, thought about the options you mentioned but am trying not to stray too far from a "stock-look" although like you I'm more of a function than form guy. I shouldn't have any problems finding a nipple that will thread in. I ran into a similar problem when I installed a bypass oil filter system on my dad's Duramax Diesel. I discovered hydrolic and pnuematic fittings come in lots of odd shapes and sizes and will readily flow oil just like any other fluid (including air). Since they are all made of brass, heat, corrosion, etc. aren't issues.
Thanks for the offer Ed_L.
Actually now that I've taken another hard look at the oil diagram, I've concluded that not blocking that short passage with an oil cooler installed, you have likely INCREASED oil flow to the top of the cylinder head.
I'm committed to the mod, I've ordered a frame rail transmission cooler to cool the oil and it has a magnetic internal filter so I'm abandoning the external oil filter idea. (Plus I couldn't find a good place to mount one.)
Once I get the project underway, I'll try to figure out how to post the pictures. I'm much better with mechanical things than computers.
Thumperclone, we agree with your assessment of the "best path." Problem is, there's only about 1 inch of clearance between that bottom bolt and a large frame crossmember and bolt. So it's tucked in neatly... I suspect the bolt that's in there won't even thread all the way out without removing the engine but I'll find out for sure next weekend when I start to tear into it.