Holley 120 4230 4150 Drop Base Air Cleaner Black w 3" Red Washable Holley 120 4630 4500 drop base air cleaner black w 3" red washable Holley HOL 120 4530 Air Cleaner Assembly Holley HOL 120 4530 Air Cleaner Assembly. Does your engine need Lots of fresh air? Holley is proud to offer a breath of fresh air with our new 16x6 inch drop base 4500 air cleaner assemblies and filters. Available in chrome or Edp black. The 6 inch assemblies are available with a red washable gauze element only. The tops are so large and smooth we decided to leave them plain for a nice stealth look, or to use as a canvas for creating your own look. They feature a 15 16 inch drop base. Features and Benefits: Available in chrome or Edp black (Electro Deposit Primer) finishes Open element style Available with low restriction washable red gauze element Fits 4500 series carbs throttle bodies with 7 1 4 inch neck Drop base Stamped steel base and lid Details: Base Color: Chrome Base Finish: Chrome Base Flange Diameter: 7. 25 Inch Base Gasket Included: No Base Material: Steel Base Style: 4500 Configuration: Multi Piece Diameter: 16 Inch Filter Color: Red Filter Diameter: 16 Inch Filter Height: 6 Inch Filter Material: Cotton Gauze Filter Type: Red Washable Finish: Chrome Flange Gasket Included: No Grade Type: Performance Height: 6 Inch Housing Finish: Chrome Housing Material: Steel Housing Surface Type: Smooth Lid Color: Chrome Lid Finish: Chrome Lid Gasket Included: No Lid Material: Steel Lid Style: Plain Marine Approved: No Material: Stamped Steel Mounting Hole Quantity: 1. 0 Nut Included: No Shape: Round Size: 16 Inch Stud Included: No Warranty: Manufacturer's Limited 90 Day Warranty Washable Reusable Filter: Yes