Check the listing for details. Gunson Eezilap Valve Lapper G4095. Condition: New. Listed at 103.75 USD. The Gunson Eezi-Lap is a simple tool that fits into a standard electric drill chuck and, when used with fine-grade valve grinding paste such as Part No. 2561, quickly and effectively grinds valves in seconds. Good engine performance depends on properly seated valves. Poorly seated or burnt valves, along with worn guides and stems, can cause hot gases to escape under compression, reducing performance and increasing the risk of engine damage. When correctly lapped (ground), the valve seat should have an even, unblemished matt grey finish. The valve head should also show this same finish on the chamfered face that matches the seat. Sadly instances of fraud are on the increase. The cost of fraud has to be passed on to all buyers in the form of higher costs. Because of this all reports of lost.