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F54 block component ?


timsz

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post-10089-0-62606100-1420758466_thumb.jpg   There is a hole in the rear drivers side of the engine block. In the pic it is in the blue area to the right of where it says Nissan- Japan. To the right of the block plugs. It looks like their's a bolt in it, in the pic. What's that hole for? Thank you.

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Some markets and vehicles used that as a heater connection point...

How does that affect head cooling?  Seems like that would be one way to block the head port for better flow without losing heater function.  The threads are the same for the plug in the block and the nipple in the head.  Swap and buy some extra hose.  The coolant through the core might also be cooler.  My heater core pumps out a ton of heat with very little flow.  I've pondered switching just for better cabin heat control.

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