Looking for reliable power valve gaskets for Holley metering blocks? These six options stop leaks, hold vacuum, and resist heat and ethanol.
Choices include Holley plug and gasket kits, a 5.5 inHg power valve kit for Holley 4150/4160, a SEAEAGLES high-temp set, a generator carburetor with fuel shutoff, and a corrosion-resistant block-off plug pack.
All use fuel-safe materials, install with basic tools, and help maintain correct AFR and vacuum reference for smoother engine operation.
| Holley 26-36 Power Valve Plug & Gasket (2-Pack) |
| Best Overall | Compatibility: Holley (2300, 4150, 4160, 4500, etc.) | Package Quantity: 2 plugs + 2 gaskets (2-pack) | Seal/Gasket Included: Yes — dedicated gaskets included (2) | VIEW LATEST PRICE | Read Our Analysis |
| Power Valve Kit for Holley 4150/4160 Carburetors |
| Performance Pick | Compatibility: Holley (4150, 4160, M2300, G59) | Package Quantity: 2 power valves + 2 gaskets (kit) | Seal/Gasket Included: Yes — sealing gaskets included (2) | VIEW LATEST PRICE | Read Our Analysis |
| Power Valve Plug & Gasket Kit for Holley Carburetor |
| Reliable Replacement | Compatibility: Holley (2300, 4150, 4160, 4500) | Package Quantity: 2 plugs + 2 gaskets (set) | Seal/Gasket Included: Yes — high-quality gaskets included (2) | VIEW LATEST PRICE | Read Our Analysis |
| Power Valve Plug & Gasket for Holley 26-36 |
| OEM Fit | Compatibility: Holley (2300, 4150, 4500, 4160) | Package Quantity: 1 plug + 1 gasket (individual listing) — (also available as single metering block plug) | Seal/Gasket Included: Yes — gasket included (1) | VIEW LATEST PRICE | Read Our Analysis |
| Carburetor for Wen Generators with Fuel Shutoff Valve |
| Generator-Specific | Compatibility: WEN/PowerPro generators (R390III 389CC/390CC 13HP models) | Package Quantity: 1 carburetor + multiple accessories (not a 2-pack) | Seal/Gasket Included: Yes — multiple gaskets included (3) | VIEW LATEST PRICE | Read Our Analysis |
| Carburetor Power Valve Block-Off Plug & Gasket (2-Pack) |
| Fuel-Compatible Choice | Compatibility: Holley (2300, 4150, 4500, 4160) | Package Quantity: 2 plugs + 2 reusable gaskets (2-pack) | Seal/Gasket Included: Yes — reusable gaskets included (2) | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
Holley 26-36 Power Valve Plug & Gasket (2-Pack)
In case you own a Holley carburetor and want a simple, reliable fix, the Holley 26-36 power valve plug and gasket 2-pack is a smart choice because it’s made to slip right into Holley metering blocks without any mods. You’ll appreciate that the set fits common Holley models like 2300, 4150, 4160, and 4500 with standard 1/2-28 threads. You can remove a worn plug, seat the new plug and gasket, and restore a proper seal to avoid fuel leaks and air-fuel ratio issues. The durable, fuel resistant materials hold up to heat, so you can count on long term reliability.
- Compatibility:Holley (2300, 4150, 4160, 4500, etc.)
- Package Quantity:2 plugs + 2 gaskets (2-pack)
- Seal/Gasket Included:Yes — dedicated gaskets included (2)
- Material / Construction:High-strength, fuel- and heat-resistant metal
- Installation Difficulty:Simple; remove old plug/gasket and install new
- Main Function:Block off/replace Holley power valve plug; restore seal and prevent leaks
- Additional Feature:Standard 1/2-28 threads
- Additional Feature:Vilapow manufacturer
- Additional Feature:Compact silvery finish
Power Valve Kit for Holley 4150/4160 Carburetors
In case you want a reliable, long-lasting solution for Holley 4150 and 4160 carburetors, this power valve kit is a great choice because it pairs sturdy brass and stainless steel construction with precise sealing to stop fuel leaks and keep your engine running smoothly. You’ll get two power valves and two gaskets that replace the 125-55 model and fit Holley 4150, 4160, M2300, and G59 units. The valves are set to 5.5 inches Hg and open and close sensitively to match engine demand. You can install them with basic tools, improve throttle response, and trust steady fuel control.
- Compatibility:Holley (4150, 4160, M2300, G59)
- Package Quantity:2 power valves + 2 gaskets (kit)
- Seal/Gasket Included:Yes — sealing gaskets included (2)
- Material / Construction:Brass + stainless steel body (corrosion resistant)
- Installation Difficulty:Basic tools; straightforward install
- Main Function:Replace power valve (125-55) to regulate fuel control and improve performance
- Additional Feature:5.5 inHg spring
- Additional Feature:Replaces 125-55 model
- Additional Feature:Brass & stainless body
Power Valve Plug & Gasket Kit for Holley Carburetor
You’re the kind of person who wants a simple fix that actually lasts, and this Power Valve Plug and Gasket Kit for Holley carburetors fits that need perfectly. You’ll find it fits Holley 2300, 4150, 4160, and 4500 models as a direct replacement, so you won’t need modifications. The metal plugs resist corrosion and stop fuel and vacuum leaks. The gasket material stands up to fuel exposure and restores reliable sealing and operation. It comes as a two-pack for quick swaps during maintenance or repair. You’ll install them fast, regain proper power valve function, and get long-term peace of mind.
- Compatibility:Holley (2300, 4150, 4160, 4500)
- Package Quantity:2 plugs + 2 gaskets (set)
- Seal/Gasket Included:Yes — high-quality gaskets included (2)
- Material / Construction:Robust metal construction (corrosion resistant)
- Installation Difficulty:Simple; direct replacement, no modifications
- Main Function:Prevent fuel/vacuum leaks; restore proper power valve sealing
- Additional Feature:Direct OEM-fit replacement
- Additional Feature:High-quality gasket material
- Additional Feature:Two-piece plug set
Power Valve Plug & Gasket for Holley 26-36
In the event you want a simple, reliable fix for Holley metering block leaks, the SEAEAGLES 26-36 power valve plug and gasket is a smart choice because it fits Holley 2300, 4150, 4500, and 4160 carburetors exactly and restores the seal that keeps your fuel mixture steady. You’ll get an aluminum plug and a high temp gasket that replace worn parts and stop air leaks. Installation is straightforward, so you can swap them quickly and feel confident about fuel delivery. The part matches OEM fit, weighs little, and comes with manufacturer warranty and Amazon returns.
- Compatibility:Holley (2300, 4150, 4500, 4160)
- Package Quantity:1 plug + 1 gasket (individual listing) — (also available as single metering block plug)
- Seal/Gasket Included:Yes — gasket included (1)
- Material / Construction:Aluminum exterior (durable)
- Installation Difficulty:Straightforward replacement; easy install
- Main Function:Metering block power valve plug to restore proper seal and prevent air leaks
- Additional Feature:Aluminum exterior material
- Additional Feature:OEM-style 26-36 model
- Additional Feature:Manufacturer part 26-36
Carburetor for Wen Generators with Fuel Shutoff Valve
In case you run WEN or PowerPro generators and want a simple, reliable way to stop fuel flow for storage or service, this carburetor with an integrated fuel shutoff valve is a great fit for you because it drops right into 389CC and 390CC 13HP R390 engines and gives fast control over fuel supply. You’ll get one carburetor, a fuel line, clamps, three gaskets, a fuel filter, and the shutoff valve. Check your old carburetor and starter solenoid relay against images before fitting. The parts improve sealing, reduce leaks, and help prevent stale fuel damage during storage or repairs.
- Compatibility:WEN/PowerPro generators (R390III 389CC/390CC 13HP models)
- Package Quantity:1 carburetor + multiple accessories (not a 2-pack)
- Seal/Gasket Included:Yes — multiple gaskets included (3)
- Material / Construction:Metal carburetor body with included rubber/plastic hoses, filter, valve
- Installation Difficulty:Moderate; replace original carburetor and match fittings/engine
- Main Function:Full carburetor replacement with fuel shutoff valve for compatible generators
- Additional Feature:Includes fuel shutoff valve
- Additional Feature:Comes with fuel filter
- Additional Feature:Complete hose and clamps
Carburetor Power Valve Block-Off Plug & Gasket (2-Pack)
In case you want a simple, reliable fix for a leaky power valve passage, this 2-pack of Carburetor Power Valve Block-Off Plugs and Gaskets is the best choice for hobbyists and pros who work on Holley carbs. You’ll get two plugs and two reusable gaskets that fit Holley 2300, 4150, 4500, and 4160 metering blocks, so you won’t hunt for parts. They seal power valve passages to stop air leaks and keep your fuel mixture steady across gasoline, race fuel, E85, and alcohol. Made from corrosion resistant, high temperature materials, they last. Installation is quick and needs no special tools.
- Compatibility:Holley (2300, 4150, 4500, 4160)
- Package Quantity:2 plugs + 2 reusable gaskets (2-pack)
- Seal/Gasket Included:Yes — reusable gaskets included (2)
- Material / Construction:Corrosion-resistant, high-temperature-tolerant metal
- Installation Difficulty:Simple; no extra tools or modifications required
- Main Function:Seal power valve passages; prevent air leaks and maintain fuel mixture
- Additional Feature:Reusable gaskets included
- Additional Feature:Works with E85/alcohol
- Additional Feature:Pack-of-two convenience
Factors to Consider When Choosing Carburetor Power Valves Gaskets
When you pick a carburetor power valve gasket, consider material compatibility so it won’t react with your fuel or carburetor parts. Check the thread size fit and seal durability to make sure installation is simple and the gasket holds up under heat and pressure. Also consider fuel type resistance, since different fuels and additives can eat away at some materials, and choose a gasket that balances long life with easy fitting.
Material Compatibility
Pick gasket materials that will live with fuel, heat, and additives so you don’t end up with leaks or repeat repairs. You want nitrile rubber NBR, Viton FKM, or a fuel-resistant composite. These handle constant fuel exposure better than ordinary rubber, so they resist gasoline and race fuels. Check the temperature rating too. Choose materials rated for 200 to 300°F so they won’t harden, crack, or shrink under the hood. Should you run ethanol blends E10 to E85 pick gaskets formulated for alcohol resistance because ethanol speeds breakdown in common elastomers. Also consider additives and detergents. Some compounds resist petroleum solvents and detergents more than others, which extends life. Favor low compression set and good sealing resilience so gaskets keep a tight seal after heat cycles and torque changes.
Thread Size Fit
Although thread size might seem like a small detail, getting it right keeps you from stripping the metering block or chasing leaks later. You should verify the thread size stamped or documented for your power valve port. Check common sizes like 1/2-28 and other standard pipe or machine threads so you don’t buy the wrong fit. Also confirm diameter and pitch because two fittings with the same diameter but different pitch won’t seal. Next, see whether the hole accepts tapered pipe threads or straight machine threads since tapered threads seal through interference while straight threads need a gasket or sealant. Measure engagement depth and clearance so the plug seats without bottoming out or hitting passages. Match originals to avoid re-tapping or adapters.
Seal Durability
Because the gasket sits between metal and fuel, you want a seal that stays dependable for years, not weeks, and that means considering chemical resistance, heat tolerance, thickness, and reuse limits all at once. You should pick materials rated for long exposure to gasoline and ethanol blends so they won’t swell or crumble quickly. Also check continuous temperature ratings around 200 to 300°F so the gasket won’t harden or crack in the engine bay. Pay attention to thickness and compression specs, since too thin causes leaks while too soft or thick can extrude under clamp load. Prefer fuel-resistant elastomers like Viton or multi-layer composites with ozone and aging test data. Finally observe reusable vs single-use ratings and service intervals before you reinstall components.
Fuel Type Resistance
As you’re matching a gasket to the fuel you run, start considering chemicals and heat together so the seal will last under real engine conditions. You want materials rated for your specific fuel. Nitrile works for gasoline and light ethanol blends. Viton or PTFE suit high ethanol like E85, methanol, and racing fuels. Check each material’s temperature range so it won’t soften or crack as the engine heats up. Also watch chemical compatibility with additives and detergents, because swelling or corrosion leads to leaks. Pick low‑swelling elastomers or coated composites for ethanol blends. For occasional use or storage with volatile race fuels, choose nonporous PTFE or metal faced composites to prevent permeation. Verify manufacturer testing for real world confidence.
Installation Simplicity
Getting a gasket installed should feel simple and quick, not like a guessing game that makes you worry about leaks later. You want fuel-resistant materials like nitrile or Viton so the gasket stays intact around gasoline and ethanol blends. Pick a gasket size that matches standard power valve plug openings and a thickness that compresses reliably, usually 0.5 to 1.5 mm, so threads engage without over-tightening. Kits that include matching plugs and gaskets save time and cut fitment guesswork. Clean mating surfaces carefully, removing old material and debris with solvent before you start. Use basic hand tools and a correct wrench for the plug thread, then apply light, even torque. Hand-tight plus a quarter turn often seals soft gasket materials well.
Performance Calibration
As you tune a power valve you want the gasket to help, not hide, the calibration, so pick thickness and material with care. You should match gasket thickness and compressibility to the valve so you avoid micro-leaks or a valve that won’t seat. Also pick a material rated for fuel and heat, like nitrile or high-temp fiber, because worn gaskets change sealing and ruin consistency. Make sure the inner diameter and sealing face match the metering block geometry so the vacuum reference stays true. Replace gaskets whenever you service the valve since reused pieces often shift opening pressure. Finally, account for the combined stack height of gaskets and hardware because 0.010 to 0.020 inch can alter the vacuum setpoint.
