The Steyr Monoblock combines the block and cylinder combustion chamber in one casting.

The Monoblock design allows this engine to have a coolant jacket where the traditional headgasket would be. As an added bonus the combustion chamber does not have to be clamped together with bolts which distort the roundness of the cylinders. A drawback would be not being able to get the valves out as easily.

The cam shaft housing of the Steyr is like a normal head split in half with the combustion chamber portion being cast as one with the block and the part that houses the cam, valves and unit injectors being removable. The unit injector found in many vehicles today is produced by Bosch etc, but is Steyr's design and patent.

These engines are found in the U.S. in marine applications it would be cool to get one in a Jeep, pickup, hotrod, golf cart etc.