16" X 6” Black drop-base air cleaner for 4500 series carburetors with 7-1/4” dia. neck Does your engine need LOTS of fresh air? Holley is proud to offer a breath of fresh air with our new 16x6" drop-base 4500 air cleaner assemblies and filters. Available in chrome or EDP black. The 6" 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" drop-base.