Race and dyno proven air cleaners feature a low profile and free flowing design that creates more power over standard flat air cleaner assemblies. Kits include a high flowing dropped base with matching lid and a 1" sure seal spacer with an integrated O-ring for a positive seal on carburetors with a 5-1/8" neck. Kit also includes a paper element filter. The 1" spacer included in this kit places the bottom of the air cleaner base 5/8" below carb neck sealing flange.