NEW SOUTHWEST SPEED RACING THROTTLE STOP KIT FOR HOLLEY STYLE CARBURETOR, FITS HOLLEY 4150, 4160 AND OTHER SIMILAR 4 BARREL CARBURETORS New Holley Style Throttle Stop produced by Southwest Speed (SWS Part # 410-920). Fits Holley 4150 and 4160 Carburetors and other similar 4 Barrel Carburetors Putting this stop in front of the throttle arm keeps the arm from over traveling, which bends the arm, butterflies, and shaft Also helps reduce wear on the base plate Lightweight aluminum construction | * Professionally designed and widely used in the performance parts market