Sealing Plate - Sec. Power Valve Cavity

The Sealing Plate - Sec. Power Valve Cavity from Holley is a precision gasket component engineered for Holley 4160 carburetors, where fuel metering accuracy depends on proper sealing at critical juncture points. This secondary sealing plate seals the power valve cavity—a chamber that regulates enrichment under load—preventing fuel leakage, air infiltration, and carburetor inconsistency. Restorers, street enthusiasts, and engine builders rely on OEM-quality sealing plates when rebuilding or maintaining Holley 4160 carburetors for muscle cars, hot rods, and performance street machines.

Manufactured from steel with a cadmium finish, the sealing plate resists corrosion in the fuel-rich carburetor environment while providing consistent clamping force against the gasket. The included gasket is pre-cut to match the power valve cavity opening, ensuring a tight seal that prevents fuel weeping and maintains proper air-fuel ratio stability across throttle transitions. Its compact footprint—measuring 4.95 × 0.95 × 7 inches and weighing just 0.08 lbs—fits seamlessly into the carburetor assembly without adding bulk or complexity to fuel delivery tuning.

Carburetor enthusiasts, restoration shops, and tuners benefit most from this sealing plate when addressing hard-start conditions, rich stumble, or vacuum leaks traced to the power valve circuit. Installation is straightforward—simply position the gasket on the cavity, align the sealing plate, and torque fasteners evenly to prevent warping. This single component is essential for any Holley 4160 rebuild kit, ensuring your carburetor restoration maintains factory precision and reliability.