MWM Acteon Workshop Manual page 108

Cylinder heads
Install the guide-pins for cylinder heads assembly
MWM nr. 9.407.0.690.030.4 in the place of two
diametrically opposite bolts. Install cylinder head
gasket with the "TOP" mark upward.
The cylinder head gasket must be perfectly clean and
must never be assembled with grease, oil or glue.
Assembly cylinder head on gasket, with the guide-
pins installed.
Install cylinder heads.
9.612.0.006.7160 - 05/04