please be careful:
the different measures are necessary to obtain the correct compression in the combustion chamber, one of the essential parameters for the correct operation of the TOP 80 engine.
the listed thicknesses are nominal, the material used to obtain the gaskets has a tolerance of + - 10%.
The correct measure, which is almost always different for each engine, must be obtained, if necessary, by coupling different thicknesses.
if you do not understand the meaning or you are not able to measure them, you need an help from your local dealer.
Neglect these measures can lead to poor performance, overheatings and permanent damages to the engine.