Buick 401 Main Bearing Lubrication

hey have a question about my buick 401 Nailhead engine. have found that the oil ducts in the engine block at the frame bearings are only drilled in the oil duct on assault 1 and 3 the other 2,4,5 are grumbled and a little down men not all the way in the oil duct ??? it should be so. and how do those who are drilled get the whole wave of oil lubrication to the crankshaft on the scaffolding
 
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