...PLEASE clean them and empty ALL fluids!!! Having to clean a grimey engine is my LEAST favorite part of the job!!! The engine can be cleaned before you unbolt it from the frame. I'll tell ya', there's nothing much more disappointing than to unpack your engine, and it's soaked with tranny fluid, and covered in grime!!! I will be charging extra for cleaning your dirty engines!!! I really enjoy building these things for you guys, but give me a break by making sure they are clean and dry BEFORE you box it to ship to me!!! Keep in mind, I'm probably getting in someone else's engine the same week as I receive yours, and the cleaner engine will be done first!