Quote:
Originally Posted by Ole Don
The flathead had an oil filter, (sludge collector), inside the crankshaft. Centrifugal forces took the particles out of the oil and they went in the hollow part of the crank. At overhaul time, you need to remove the plugs and boil the snot out of the crank.
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Correct me if I'm wrong, but as I recall it, the early Ford Y-blocks had a hollow cast-iron crank and the oil holes were located in the journals such that oil inside the crank would be thrown out upon the rod bushings by centrifugal force. But later truck Y-blocks had a solid steel crank without the holes.