Thermostat Housing Engine Coolant Thermostat Housing Air Vent (Bleeder Valve):No Bolt Hole Center To Bolt Hole Center:2.375 In. Bolt Hole Diameter:0.25 In. Bolt Hole Quantity:2 Bolts Included:No Color/Finish:Natural Flange Thickness:0.8 In. Gasket or Seal Included:No Height:2.875 In. Housing Neck Angle (�):45 Deg. Inlet Port Diameter:2 In. Material:Metal Mount Hole Diameter:0.25 In. Mount Hole Quantity:2 O Rings Included:Not Required Outlet Diameter (in):1.25 In Package Contents:1 Thermostat Housing Thermostat Included:No Thermostat Opening Temperature:Not Applicable