Ok so I had my tuner supply me with 10:1 pistons for the turbo build but there is no info on the box label or spec sheet to identify the compression ratio. I called JE and was told they are 8.5. Just by looking at these I know that is bs lol. Then I googled the part number and get a few diff listings. 9.5, 10.5 and 11

Obviously I would like to for sure know the CR of my engine before stuffing a **** ton of boost down its throat.

My setup is a B18a bored to 84mm with a b16 head. ANY HELP WOULD BE GREATLY APPREICIATED! Trying to get a awnser from JE is not going well

JE Part # is 185919 for b16a1/a2/a3 here is a pic of the actual pistons I recieved

 

Bore (in):3.307 in.
Bore (mm):84.000mm
Piston Style:Flat top, with four valve reliefs
Piston Material:Forged aluminum
Compression Distance (in):1.181 in.
Piston Head Volume (cc):+1.70cc

Plop those numbers in here. Match with block, head, crank, rods. Poof out comes compression.
http://www.zealautowerks.com/bseries.html