How Come This Slant has An extra hole on the head?

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MAGA

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I’m rebuilding a spare slant and will swap them. I noticed the head (by the Thermostat) has an extra hole compared the one I just pulled. Does anybody know what goes in each hole?

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In your case,a plug. Would likely be for the egr control or emissions control. A thermal vacuum switch similar to what you have.
 
Hey maga- does your new water pump have a extra metal plate on the backside? With two gaskets to sandwich everything?
 
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