Boost Activated Power Valve for Holley based carburetor BAPV BRPV 4150 4500 2300 New Type: Carburetor Boost Activated Power Valve Rebuild Kit Sub-type: Boost Activated Power Valve Color: As shown in picture Material: Stainless steel + Brass + Metal Placement on Vehicle: Carburetor Features: This power valve fits virtually all Holley based carburetors. Convert your standard carb into a blow through with ease. These power valves improve driveability and deliver increased fuel flow for forced induction applications. Compatible with E85 fuel. No main body grinding required for most carburetors. Includes all components needed for installation on front or rear of carburetor. Valves are machined and assembled in-house, set and tested on dedicated fixtures. Machined from solid billet extrusion. Includes stainless steel check ball, stainless spring, and brass seat for long-lasting, corrosion-free performance with any fuel type. O-ring seal eliminates need for gasket. Boost referenced by bowl pressurization. The higher the boost, the more the valve opens to meet increased fuel demand. Full-flow design opens directly to the fuel bowl with no flow restrictions or delay in response to boost pressure. No diaphragm to rupture or wear out. Valve can be used on primary or secondary side. Secondary side installation requires 3/8 OD pickup tube attached to brass extension tube. Package includes: 1 - BRPV 1 - Drill / Tap 1 - Set screw 1 - Fuel pickup tube