Short Block vs. Long Block Car Engine

If you are thinking about replacing your car's engine or upgrading your car's engine for performance purposes, knowledge of the types of engine block assemblies available will be valuable. Among other things, you should know the difference between "short block" engines and "long block" engines before you get busy trying to pick and purchase an engine block.

Differences Defined

Short block and long block engines have the same external dimensions, but they contain different components. A short engine block essentially consists of a block casting, cam pistons, connecting rods and a crank or, in other words, the engine block without the head. A long engine block, on the other hand, includes the head, which is bolted to the short block.

Benefits Compared

The fact that a long block engine is installed into a vehicle in an almost complete state means that it offers potential performance benefits. A short block engine requires additional parts, but this allows more choice.

Expense Considered

A short block engine requires more additional parts and more time for assembly and installation than a long block engine requires. This means that, with parts and labor both considered, a short block engine is a more expensive option than a long block engine.

References

• Cars Direct: Short Block vs. Long Block Engines
• Hi Performer: Long Block Versus Short Engine Block