Bavarian Solutions  [ Cylinder Head Services - O-Ring'ing ] Bavarian Solutions offers the service of o-ring grooving cylinder heads and receiver grooves for the engine block. We understand the significance of making sure the o-ring groove is at an appropriate depth in addition to choosing the correct wire diameter. Utilization of o-rings in your engine will prevent the cylinder head from lifting in instances where you intend to run higher levels of boost with your forced induction setup or high compression naturally aspirated setup.