where do I install the block heater freeze plug?

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20+ Year Stangneter :roc</strong><span class=
Jan 29, 2003
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Hey folks,

I am having an engine built and I am supplying the builder with a block heater freeze plug. What is the most favorable 'hole' (is there a proper name for it?) to ask them to install it in? (and why?)

Thanks!
 
Mustang block heater freeze plug discontinued, truck version still available!!??

Not sure what the difference is......would this have anything to do with chosing the location?