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40 Z Engine oil return line

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I wondered about a restrictor in the Zephyr engine oil return

line, the line is original from what I can tell, and the inlet

line from the oil boss has a coil about 2/1/2 turns going to

the filter, the 5/16 return line is reduced to 1/4 inch where

it enters the block above the oil pan, it has no retricting orifice

that I am aware of!.

What has been the practice for restricting the oil flow from the filter?


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