Pretty sure wallace uses .050 numbers it's the same as this

http://www.rbracing-rsr.com/comprAdvHD.htm

Static compression ratio of 9.35:1.
Effective stroke is 3.39 inches.
Your dynamic compression ratio is 8.57:1 .
Your dynamic cranking pressure is 173.77 PSI.
Your dynamic boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 0 PSI is 8.57 :1.
V/P (Volume to Pressure Index) is 210

I have a detailed dyno program and it gives the same cranking compression!