I will begin to slowly talk about assembly Cylinder head before treatment after plug the oil channel VTEC It was made by grinding the plane, milling valve seats, grinding, cleaning valves, moved guide, threaded plug for oil duct block B20B with piston PHK (B20Z) to increase the compression ratio to 10.2 It was made honing, grinding. I do not know how to properly translated . If something is unclear ask - try to explain .