Originally Posted by MB140300SD

Here are a few ways to tell if the engine was replaced with a factory crate engine. The engine number will be blank after 603 on the flat surface by the IP. It will have torx bolts for valve cover and other fasteners instead of head heads. It will have a part number plate on the passenger side bell housing. I have a 92 300SD that I picked up for $300 that has a factory crate motor and is the smoothest running diesel I have ever seen.