Dec 17, 2020 · There’s a power valve in every Holley four-barrel carburetor and we’re going to show you how it can offer improvements in throttle response and even potentially save a little fuel for the guys who plan on lots of highway and street miles.

Apr 14, 2015 · When it comes to tuning a Holley carburetor the power valve has always seemed a mystery to many. But, once you know how power-valves work, it’s easy to select, troubleshoot, and install the right one for your application.

Jul 4, 2019 · Holley’s power valve is a simple, spring-loaded diaphragm valve that uses engine vacuum to pull the valve closed. Rated in inches of mercury (InHg), as an example, the most common rating is a 6.5. As the throttle opens, manifold vacuum drops from a high of around 16-18 InHg down to around 0.5 InHg at wide-open-throttle (WOT).

LS Valve Covers & Engine Appearance; LS and LT Accessory Drives; LS and LT Drivetrain; LS and LT Ignition Products; LS and LT Nitrous Systems; LS and LT Swap Oil Pans; View All ‌ Brands. Brands; ACCEL; DiabloSport; Holley EFI; Range Technology; ADS; Dinan; Holley RetroBright; REKUDO; AEM; Drake Muscle Cars; Hooker; Rev Wheels; AEM EV; Earl's ...

Explaining the Holley Carburetor power valve and how it works. I've seen several videos spreading false information and function about the power valve. I've ...

Mar 7, 2013 · The incorrectly sized power valve, or a blown-out power valve can cause problems like poor fuel economy, black smoke emanating from your exhaust, dark or fouling spark plugs, and a poor idle. If you suspect that your carburetor has a blown-out power valve, you can perform this simple test.

1 - 20 of 20 results for Holley Power Valves Compare Filter/Refine. Sort By: Compare. Holley Standard Carburetor Power Valve - 125-35. Part #: 125-35 Line: HLY. 90 Day Limited Warranty. Flow Capacity: Standard. Type: Single Stage. Compare. Holley Standard Carburetor Power Valve …

Holley carburetors blowing power valves. Nothing could be further from the truth. Holley performance carburetors built since 1992 have utilized a power valve check system that effectively eliminated this infrequent problem. Consisting of a spring, brass seat and check ball, the check ball system is 100% effective protecting the power valve ...

Mar 12, 2023 · A Holley power valve is a small, spring-loaded valve that sits inside the carburetor’s main body. Its primary function is to regulate the amount of fuel that enters the carburetor’s main metering system.

power valves: The number stamped on a power valve, such as 65, indicates the manifold vacuum below which the power valve is operational. In this case, all manifold vacuums below 6.5” Hg, the power valve is operating.