Notes on cylinder heads - RA01001194000X(01-4000)
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The cylinder heads for the "closed-deck" and "open-deck" crankcases 01-1000 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-deck" 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