REQUIRED For Replacement labeled Engines, Long Blocks, and short blocks sold within the U.S. and U.S. Territories the engine core (i.e. old engine) that is removed MUST be returned to your selling Caterpillar dealer, so that they can return to Caterpillar OR destroy, as required by law. Proof of return or destruction will then be provided to the EPA and or California ARB if required. See PELJ1301 for additional details. The 4-cylinder Engine Block houses the pistons, which move up and down inside the cylinders. The combustion chamber is the space between the piston and the cylinder head. It is where the air-fuel mixture is ignited and burned, creating the power that drives the machine. The Cylinder Block also helps to keep the engine parts in alignment.Attributes:• Transfer power from the pistons to the crankshaft• Helps to dissipate this heat by transferring it to the cooling unitApplications:The 4-cylinder Engine Block is the main structural component of the engine. It provides support for the pistons, connecting rods, crankshaft, and other components.