Cylinder Head Assembly: Application and ID

The cylinder heads for the "closed-deck" and "open-deck" crankcases have different combustion chamber shapes.
- "Closed-deck" oval on one side.
- "Open-deck" straight on both sides.

In addition, the oil return flow gallery at the rear is positioned offset.

The "open-deck" cylinder heads have one M8 bolt hole less at the front.

Engines 119.971/975 the "open-deck" design of cylinder heads can be used on "closed-deck" crankcases when performing repairs.

Engines 119.970/972/974 the "closed-deck design of cylinder heads can be used alternatively on "closed-deck" and "open-dock crankcases when performing repairs, as of engine number:
- 119.970 12 021 287
- 119.972 12 as of start of production
- 119.974 12 004 782