Found this model and saw that some people were requesting a V8 Engine Block. I found this one online and cut the bottom flat so it should print without support of any kind.

The front of this engine block is same as the rear. I guess whoever modeled it didn't know the back of an engine block is different.

Just scale it and print it. You shouldn't need any support. I'm in the process of printing it myself and will post my results when I'm finished.

Also if anyone can tell me what exactly this engine block is from I would like to update the info about it.

Original design: http://www.123dapp.com/123C-3D-Model/v8-Engine-Block/597837