This is a close-up on the intake port of a modern head from some sort of high-zoot Honda (called a B18A). Ali told us more about its application, but since it’s not a 4x4, we glazed over that information. It’s apparently a desirable head to import tuner-types. The combustion chambers will be cleaned up and shaped for maximum power, and the intake and exhaust ports will be polished and honed. The divider (which changes the intake port from one large port to two smaller ones for each of the two intake valves) will be sharpened, curved, with the edges beveled into the wall of the port to maximize flow. The technological evolution between this and the GM flathead is astounding.