Been driving the Tahoe on and off for the last month. It's been a pleasure to drive and I think the 6.0 is substantial over the old worn 5.3, but I haven't yet decided if that is a placebo effect. I had the ECM bench tuned to enable the fans and adjust for cam & idle; proper dyno tune still on the docket once everything is sorted. I've done the first oil change ~500 miles and decided the Tahoe was fully 100% trustworthy and back to it's old reliable self. This week it just surpassed 700 miles on the new engine, but then this problem reared it's ugly head.
As I pulled into a parking spot at the store, I noticed a drip drip drip trail on the asphalt leading to the Tahoe. Sure enough, it was oil. Started it back up and the leak was pretty substantial so I had it towed home. I crawled under and saw it's coming from the back of the block, so I went after the obvious first, oil pressure sensor. With a mirror, I could see a little bit of oil present all around the pressure sensor. Grabbed the 1 1/16" deep socket to make sure the pressure sensor hadn't loosened up somehow, and snap. It must've been already compromised with how much oil was dripping to the ground. I barely cranked on it, to make sure it was snug and it snapped almost immediately. So the male half of the sensor is now stuck in the block, as can be seen in the mirror picture attached.
I guess the intake is going to have to come off to deal with this correctly. It sucks to do so much disassembly to get to it proper, but unless someone who's BTDT knows a trick with the intake in place, I've got a job ahead. Anyone else had this happen? Any and all pointers, suggestions etc appreciated. Thanks all.