By the number of notches at the place indicated by the arrow, it is possible to determine the thickness of the cylinder head gasket used. The above table provides an explanation.
Notches are also visible from the outside, in the assembled state, with the head installed. If the cylinder head is changed in the engine, the old head is removed or reinstalled, then you can buy a new gasket, taking into account the number of notches on the old one. If parts of the crank mechanism are replaced (crankshaft, connecting rod, piston) or the entire engine block, the piston protrusion must be remeasured. The boss size is the height that the piston protrudes above the cylinder block.
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