| High engine subfamily | Culasse |
| Cooling | Liquide |
| Studed cylinder head | Non |
| Cylinder head architecture | Sectional |
| Cylinder head material | Aluminium |
| Gaskets supplied | Non |
The DOPPLER cylinder head is made of aluminium. The combustion chamber is machined with a bi-hemispherical switch effect which results in better engine compression. The centrally positioned spark plug provides a better explosion and a higher pressure on the piston. The O-ring assembly provides better sealing and a more accurate chamber volume.