Holley 6-502-2 Carburetor Needle and Seat

A Bigger Seat Size Will Flow More Fuel A Smaller Seat Size Will Flow Less Fuel At A Given Pressure Steel Tipped Inlet Needles Are Necessary When Using Exotic Racing Fuels Or Alcohol Or When Using Benzine Or Acetone Additives Limited 90 Day Warranty

Specifications

Compatibility - Holley Small Four Barrel Carburetors
Flow Type - High Flow
Adjustable - Yes
Seat Size - 0.120 Inch
Material - Steel
Includes Hardware - Yes
Quantity - Set Of 2

Holley offers a number of needle and seat assemblies for its Carburetors. The configuration of the needle and seat assembly and its seat size depend on Carburetor application CFM size and type of fuel bowl used. Operation is simple. Needle movement is controlled by a metal tang on the float arm. Upward movement of the float causes the needle to close the seat downward float movement causes the needle to open the seat. Seat size determines how much fuel can flow at a certain pressure. A bigger seat size will flow more fuel a smaller seat size will flow less fuel at a given pressure. Steel tipped inlet needles are necessary when using exotic racing fuels or alcohol or when using benzine or acetone additives. A 0.097 Inch seat size should be used for small four barrel Carburetors a 0.110 Inch seat size should be used for Carburetors up to 735 CFM larger seat sizes should be used with Carburetors 750 CFM and larger.