engine block

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The cast metal block containing the cylinders of an internal-combustion engine.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The metal casting that contains the piston cylinders of an engine

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a metal casting containing the cylinders and cooling ducts of an engine