Naturally, a port and polish job is where Nick Hunter began the evolution of our replacement 20V cylinder head. On the intake side, the injector area was blended into the port roof and the port entrance gasket matched. Then the port divider was knife edged and the port gradually tapered down towards the bowl. In the exhaust side ports, the nasty short side radius bump was removed, the port divider wall knife edged, and then opened up approximately 15-20% in cross section. In both the intake and exhaust ports, the valve guides were ground near flush to improve flow. To round out the headwork, the seats were cut with a fresh valve job and the area around each valve was de-shrouded.