Trick Flow Emission and Thermactor Plug for Most Aftermarket 5.0L and 5.8L Cylinder Heads.Most aftermarket cylinder heads are not side specific. These thermactor plugs are designed to plug into your heads, to change the thread size to allow you to use your factory accessory drive brackets. These plugs are also used to close off any air passages in your heads.
Made from steel and then zinc plated. Features a 5/8"-11 male thread pattern.
*Sold individually, use 2 per car.
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