3. This salvage 5.3L engine came from an ’04 Chevy Trailblazer. For $600 on eBay, the car’s owner got a running, all-aluminum 5.3L, a real catch. Unfortunately, the factory oil pan on the 5.3L won’t work when retrofitting this engine into an earlier vehicle. Because LS engines use a gerotor-design oil pump that’s driven off the crankshaft, the oil sump pickup is located at the front of the engine.