I WONT TO FIGURE OUT COMPRESSION If I CAN. THE ONLY INFO THE GUY THAT'S SELLING THE PISTON CAN TELL ME IS THAT THY CAME OUT 0F A 402 AND THE THAT IS STAMPED 2347F30 CLOSED CHAMBER DOME AND .100 HIGHT ON THE DOME.
I would calculate compression ratio using the piston dome volume of about 15cc.
A TRW L2399F30 piston w/a 0.095" dome has a dome volume of 13.8cc. and 9.71:1 CR using 107cc chamber heads. The 2399's are open chamber pistons.
A L2349F closed chamber piston has a .265" dome, extrapolated to a 0.100 dome, this becomes about 11.5cc, but because of how the dome is shaped (wider at the bottom) this figure is low- which will put you back in the 15cc range, IMO.
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