I just looked at service manual. It is pretty sketchy but it is the second cam bushing from front that delivers oil to rockers. There is a hole in block right next to the third rocker arm shaft support from front. I don't remember if there is a corresponding hole in the head or if the oil goes up along side of the head bolt but the head gasket has a ring in it that surrounds that hole. Like I said before, I do remember that one engine that the rocker support interfered with oil supply. I had started it and ran to warm up for retorque and readjust valves and had no oil to rockers. On another note, perfect circle used to tell us you could run a car a 100 miles with no oil to rockers. They used a test procedure which varied with different models of engines to check for oil consumption through the valve guides by blocking the oil supply to rockers. I do know they run quite a while with just assembly oil but then start raising heck.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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