Raise your air cleaner to help clear your throttle linkage and distributor with this new 1 inch aluminum sure seal spacer / adapter with o-ring. The o-ring makes a tight seal between the carburetor and air cleaner, and keeps debris out of your motor. This adapter fits Holley 4 barrel carbs model 4150 gas and alcohol, 650, 750 and 850 CFM, C & S, Race Demon and BLP Carbs.