lol
Yes 8.9:1 thats using stock ST170 bottom end, stock black top head and the thicker FRS head gasket (2.5mm IIRC).
My limiting factor now is the rods and pistons, they are only good for about 350bhp... My CR is not an issue, the original Focus ST (not ST170) ran a CR of 9.0:1 and is turbo charged for example.
I'm on MS2 mate, self built and mapped.