Please note: The new piston crown is marked with paint indicating the corresponding cylinder numbers.
Pistons in cylinders 1 and 2 (designation 1/2): large recess in the piston crown (for the intake valve) facing the flywheel (arrows).
Pistons in cylinders 3 and 4 (3/4 designation): large recess in the piston crown (for the intake valve) facing the timing drive (arrows).

(The text is copied from this portal: vwmanual.ru)

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