I was pulling an empty seed tender to a meeting a few days ago with my 05. Truck has 70,000 on complete overhaul. I started hearing a ticking noise, when driving down the road. I opened up the hood and thought it was an exhaust gasket. I continued on down the road and the noise started getting louder. Engine had good oil pressure and seemed to be firing on all cylinders. I pulled into a convenience store and looked under the engine. Sounded like a rod or rod bolt hitting the oil pan and had white blow by from the tube. I quickly shut truck off and called the tow truck. I’m curious what happened and what the issue is. I checked oil level after tow truck dropped off my truck. Oil level is in upper safe zone. I’m wondering if a valve seat didn’t drop. That would explain knocking noise and blow by, but thought I should have one cylinder not firing.