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I have seen that before I cant remember if it was a 215 or 223 I know it was in a 58
F350. The right side of the tubing goes into the camshaft and the left goes up a
galley to the rocker arms and the bolt is where the oil sender goes. I saw that on 216
Chevs and Straight 8 Buicks. Myself I think its better than the way Y blocks did it which
usually plugged up starving upstairs. External oil supply can be blown out with air gun.