High-port - throttle body sits below the injectors (you can see the injectors but not the throttle body).
Low-port - throttle body sits above the injectors (you can see the throttle body but not the injectors).
91-93 SE-Rs, 91-93 NX2000s and 90-93 G20s had high-ports, while '94 and above SE-Rs and G20s had low-ports.
Source: Harris
