Here's some pics and info on the 1957-9 Dodge 230 head. It differed from previous models by offering flow AND compression (7.9:1). Casting number is 1676337-1 or 2. Pic #1 shows the chamber side. Note that the transfer port extends further into the cylinder than earlier heads, and is more rounded at the end. Pic #2 shows the chamber with the piston overlay (paper disc). Pic #3 shows the cylinder area of the chamber and the quench area outlined in black marker. The quench area (1/4 moon shape)