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Discussion Starter · #1 ·
I have a 99 Mustang Gt and I just got this brand new engine with PI Heads, there are two holes on the inner sides of the heads that I have no clue what goes there. Original thought was that knock sensors go there, but only the Dual Cam engine has/requires those. Anyone know what goes here?
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No, depending on the year it used either coolant temperature sensor or a cylinder head temperature sensor. 1999 2 valve uses a coolant temperature sensor located in the intake manifold.
 
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