I cant figure out my compretion ratio,

81.4 mm stroke b17 gsr crank
86 mm bore CP 13:1 pistons
42.7 cc combustion chamber b16 head
7.7 cc piston dome displacement
151.562 mm eagle 5.967 rods
211.84 mm b20 deck height
0.029" oem thicknesss head gasket with a 86mm bore

any help?

I would like to be around 12:1 max.