Empi Cylinder Heads GTV-2 Stage 2 Wedge Port 42x37.5 90.5/92mm Bore PairEmpi Cylinder Heads GTV 2 Stage 2 Wedge Port Valves 42x37. 5 90. 5 92mm Bore The EMPI GTV 2 Cylinder head casting out classes all the competition! These new port designs include most of what DRD Racing Heads previously offered. Our programs cut the Intake Port, Exhaust Port and Combustion Chamber with CNC precision. You now have a smooth, ready to bolt on finished head. Beefed up Intake & Exhaust Ports allow massive porting without the need for