Holley 116-2 Center Hung FloatCenter Hung Float Brass Float Kit Part Number: 116 2 Center Hung Float Brass Float Kit Features and Benefits Genuine Holley Quality Parts Use of brass floats on the secondary side of Model 4160 carburetors factory equipped with nitrophyl secondary floats such as part number 0 3310C for Example, may cause the float to contact the metering plate resulting on loss of fuel control and flooding.