Floats for Holley 2-bbl and 4-bbl performance carburetors come in two basic designs: side hung and center hung. A side hung float is so-called because the float arm is attached to the side of the float and it is hung or pivoted from the side of the float bowl. A center hung float has its float arm attached to the float center and it is hung or pivoted from the center of the float bowl. The float material used in any particular carburetor is very often dependent on the carburetor usage. For example, carburetors designed to run on alcohol must use a brass float: carburetors set up for blow-through forced induction systems need to use nitrophyl floats; carburetors used on a draw-through forced induction system could use either a brass or a nitrophyl float. Today, Holley float designs are manufactured in only brass on nitrophyl, and they are interchangeable, except on secondary 4160 with brass center hung floats. Most Holley performance carburetors have externally-adjustable floats. This feature greatly facilitates ones ability to help keep the carburetor in perfect tune.
Holley Performance Emission Code 5: This part is legal for sale or use on Emissions Controlled Vehicles; Uncontrolled (Non-Emissions Controlled) Vehicles; and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations
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.
About Holley Performance Products
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every Monster Energy NASCAR Cup team and nearly every NHRA Pro-Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS scene as well. Holley's products also include performance fuel pumps, intake manifolds and engine dress-up products for street performance, race and marine applications. As a single solution or partnered with products from other Holley companies we can give you the edge you need over the competition!