This billet IAC housing is CNC machined in-house and anodized "BLACK" to protect from corrosion and keep it looking great. This housing fits 94-97 LT1, eliminates the hot engine coolant passage to keep your incoming air cooler. This is the same housing that comes on our Billet 58mm Throttle bodies and works great on all stock as well as our 52mm throttle bodies. Each IAC housing comes with a new gasket and three stainless steel bolts.