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[Se7enS1ns]

Ok i know this question gets asked a lot, but im struggling to find the data to work this out myself now so this really is a last ditch attempt... Can anyone tell me what the compression ration based on the following is:

Bore = 2.84'', Stroke = 3.2'' to give 1330cc
Head chamber volume should be 21cc (12g940 casting), although might be 20 as its had a bit skimmed off.
Pistons are AE/Hepolite low drag slipper type P21251's (+0.060) so *should* be 8.1cc dished)
Rings to suit above, two compression rings at 1.5mm, one oil control ring at 3.00mm i believe (some of you may know better!)
Block face to piston crown depth = 0 as decked flush
Head gasket CC = 3.4cc compressed.

Had a quick look on minispares website and it says the compression ratio for the piston + ringset = 8.8:1. dunno if this is any use to you.