Need to know if ive been cheated by authorized agent workshop

[SupRob]

Head gasket will affect it very little, all to do with the compression rating agaisnt piston protrusion,

1 Notch head gasket
Thickness: 0.65mm
Suits piston protrusion less than 0.078mm

2 Notch gasket , T=0.70mm
thickest available Suits piston protrusion more then 0.078mm

Thicker Gasket is always supplied in Rebuild kits, Cylinder Head Kits, Unless requested.