Ducati SUPERBIKE 848 MY 2008 Manual page 448

Cylinder head assemblies: checks and adjustments
Checking the closing clearance
Using a feeler gauge, check the clearance between the closing rocker arm (C) and the highest point of the camshaft
lobe (D).
The clearance must be within the specified limits (Sect. C 1.1,
If it is not, remove the closing shim (1), as described in the paragraph
replace it with a shim of suitable thickness to obtain the specified clearance.
Notes
Closing rocker arm shims measuring from 2.2 to 4.5 are available as replacement parts: each shim is marked with its
size.
Check and adjust the clearances of all valves.
Refit the opening and closing shims as described in the paragraph
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Timing system/valves).
Removal of the valves
Reassembly of the cylinder head
(Sect. N 4.5), and
(Sect. N 4.5).