This insert has a higher volume / lower compression ratio, meaning better overrevolution characteristics and more top speed. However, keep in mind that this compromises bottom power reaction. The combustion chamber fits the VHM cylinder head perfectly and is easy to change. The last numbers of the part number are engraved on the insert for identification.
Use in combination with VHM head AA33208.
Use 105 RON octane fuel.
Use the insert chart as a general guideline to select the insert depending on the fuel, track and elevation.
- More mid range power
- Quick to adjust
The insert does not fit into an OEM head, only a VHM cylinder head.
