Short block
From Wikipedia, the free encyclopedia
Short block is an automotive term describing an engine sub-assembly.
A short block is the portion of the engine block below the head gasket but above the oil pan. A flathead engine will also include the cam and valvetrain. The overhead valve style of engine will not include the aforementioned parts on the shortblock. A shortblock is usually purchased to upgrade the water jacket, piston size or bore. Assemblies typically include the crankshaft installed and balanced along with the main bearing.
A short block is considered destroyed when it either warps or cracks.