Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to rebuild an engine [title] Thoroughly clean the engine before beginning if possible. [step] Accumulated dirt, grime, and grease will make removing bolts and disconnecting components a messy job. [title] Position the vehicle near your hoist.

Ending1: [step] You'll need to be able to work on an even and well-lit surface, with enough room to position your hoist and maneuver around. If you've got a big enough garage, all the better. Ending2: [step] Your hitch should be positioned at the top and lower point of your apa. Resist the urge to turn the hitch to one side. Ending3: [step] Lay a large tarp down beneath the vehicle, and set your hoist on top of it. This will prevent sludge and debris from getting into the engine. Ending4: [step] Since you will be lifting the engine, you will want to make sure that you am sitting comfortably on top of it. [substeps] Check the truss rod for all necessary bolt locations.

Answer format: ending1/ending2/ending3/ending4