Holley 2300C, 4160, 4160C carbs

		open exposing the discharge slot, the fuel-air mixture flows from both the idle transfer slot and discharge slot.

		(2) MODEL 4150 G and MG - Fuel flows from the secondary fuel bowl through the main metering jet, up the idle well and throughthe idle feed restriction. Then it crosses a short horizontal passage and blends with idle air from the idle air bleed. This fuel-air mixture flows down a vertical passage to the idle adjusting needle.

		Part of this mixture flows into the idle discharge passage and part into the idle transfer passage. The fuel-air is discharged through the idle discharge hole into the throttle bore below the secondary throttle plate. As the throttle plate is opened fuel-air is discharged into the throttle bore from the idle transfer slot.

		(3) MODEL 4160 - Fuel flows through the main metering restriction up the diagonal passage through the idle restriction.

		The fuel then flows past the idle air bleed and down a vertical passage. At the bottom of this passage the fuel-air mixture flows into the main body and down into the throttle body. Fsel is discharged into the throttle body below the throttle plates from the idle discharge slot.

	Secondary Idle and Transfer System

mixture to the other systems ONLY WHEN THE FUEL IS AT THE SPECIFIED LEVEL.		(4) MODEL 4160 WITH MECHANICAL SECONDARYS - With the secondary throttle plates closed the fuel flows through the main metering restriction up the diagonal passage through the idle restriction. The fuel then flows past the idle air bleed and down a vertical passage. At the bottom of this passage the fuel air mixture flows into the main body and down into the throttle body. The fuel is discharged into the throttle body below the throttle plates from the idle discharge hole.

All model 4160 carburetors have a balance tube which runs from the secondary fuel bowl to the primary fuel bowl. This tube prevents flooding in the secondary fuel systems.

B. IDLE SYSTEM - Because of driving habits, some drivers would use the secondary side very little or not at all. If the secondary system remains inoperative over long periods the system may become blocked with gum and carbonforma tions. To prevent this condition, an idle system is incorporated on the secondary side to insure clean operation under various driver conditions.

		C. MAIN METERING - When the secondary throttle plates are opened further, the pressure differential within the carburetor causes the sec ondary main metering system to function.


		The fuel enters the secondary metering body from the fuel bowl through the main metering restriction and up the vertical passage.
(1) MODEL 4150 - Fuel flows from the secondary fuel bowl through the secondary main metering jet into the idle well, then up a vertical passage through the idle transfer feed restriction across a short passage. Here the fuel blends with air coming from the idle transfer air bleed. This fuel-air mixture flows down a vertical passage to an entrance into the main body. From here it goes down the main body into the throttle body and discharges into the throttle bore below the second ary throttle plate. As the secondary throttle plates

		As the fuel goes up the vertical passage it passes the main well bleed. This fuel air mixture passes into another short horizontal passage lead ing into the main body and the discharge nozzle. This fuel is discharged into the booster venturi and then in the air stream of the carburetor ventur i.