Ferrari California Workshop Manual page 220

Replace the variable timing adjuster control solenoid valves (
Remove the variable timing adjuster solenoid valves
Remove the camshafts from the cylinder heads.
Removing the cylinder heads
F3.16).
Undo the screws indicated.
Remove the cap (A).
Undo the screws indicated.
Remove the cam tower caps (B).
Undo the screws indicated.
Remove the cap (C).