Realizing these engines are almost 70 years old, and they have been in the hands of several people. After removing the oil pump to clear the engine so cam could be removed, i noticed the oil pressure bypass valve (the one used to circumvent the oil filter if it should become clogged) was missing. In its place was a metal tube (see picture). If i understand the mechanics of this alteration the oil would flow past the oil filter at all times. I have removed the tube and inserted the valve assembly (spring, ball and guide) as it should be. The question i have is,.....why in the world would someone make this alteration, is there some advantage to having done so.