How To Lap Valves Restore An Old Car
Give the valve stem a light coat of engine oil before putting it in the guide. I use 5/30W, but it really shouldn''t matter. Spread a bit of grinding compound onto the edge of the valve. Stick the Rubber Cup On the Valve Face. Once the valve is in the head, the next step is to wet the suction cup on the lapper and stick it on the valve face.