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That boss taps off the high-pressure feed to the main oil galley. As such, you can use it for whatever you would like to lubricate. However, you might want to consider a restrictor if you are going to use it to feed a Turbo so you don't blow out the Turbo seals.
 

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Mercenvy is correct about the use that Ford intended for that particular boss. That means you want to be sure of two items:
  • First, you should satisfy yourself that drilling out the boss for a fitting will only penetrate the oil return to the block passage (the top passage).
  • Second, you want to ensure sufficient material is left after drilling and tapping to support the fitting you intend to use.
The lower oil port is the unfiltered oil from the pan that is on its way to the oil filter before being returned to the main oil galley. The particulate matter that is in this oil, which the oil filter removes before returning the oil to the main oil galley, will damage the bearings in your turbo. So, be sure you are using filtered oil to lubricate the turbo.

The last item to verify is that you do not break through the casting wall into the pre-filter oil passage when you drill out the boss. This would allow unfiltered oil to gain access to your turbo and also the engine. Astute readers will recall most oil filters do not filter 100% of the oil. The filter design contains a bypass that opens whenever oil filter media becomes saturated with particulate matter, and the internal filter back pressure reaches the target opening pressure for the bypass valve. In simple terms, your engine may not filter 100% of the oil that the pump pumps — especially when it is time to change a filter. That means you will need to be the policeman and stay on top of your filter maintenance/change program to avoid this outcome.
 
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