After the train run in June, I noticed a small coolant leak on the 4Runner. Took a deeper dive, and my head gasket is leaking (again). Then, about a week later, I started to hear a slight knock. It's still drivable, but a ticking time bomb at this point. Found a new motor with under 200,000 miles in Idaho Falls and picked it up last weekend. Before it goes into the runner, I plan to do an oil pan seal, rear main, exhaust gaskets, knock sensor, and intake manifold gaskets. I'm hoping to get it in sometime in August when time allows.