BG Fuel Systems now offers the renown machined billet aluminum Demon baseplates for all 4150-style, 4-corner idle carburetors. They are virtually indestructible correcting a major cause of baseplate damage, broken mounting ears due to over tightening of the baseplate. These CNC-machined billet baseplates also precisely align the throttle shafts, assuring the proper alignment of the throttle geometry. These baseplates feature three vacuum ports, two constant and one ported giving flexibility for street or track use.