Dynamic comp on 390
Use the Wallace Calculator. My ASSumptions include an elavation of 366 feet.
Camshaft, Rod Length, Boost and Altitude Correction to Compression
Static compression ratio of 11.7:1.
Effective stroke is 2.92 inches.
Your dynamic compression ratio is 8.81:1 .
Your dynamic cranking pressure is 183.51 PSI.
Your effective boost compression ratio, reflecting static c.r., cam timing, altitude, and boost of 0 PSI is 8.74 :1.
V/P (Volume to Pressure Index) is 157.
Edit , I see Comp Cams aren't being clear on their timing figures on the cam card. Those #'s are not at .006 there at .050 on their illustration.
Is there not a "value" given for piston valve reliefs?