If you’re looking to boost your engine's performance, the Manley Valve - Exhaust, Valve-S/D 1.625,+.200 is a fantastic choice. Designed for automotive applications, this valve is built to meet the demands of high-performance engines. With its precise engineering and quality materials, it can significantly enhance your vehicle's exhaust flow, ensuring that your engine breathes better and operates more efficiently.
This exhaust valve is engineered for domestic vehicles and adheres to industry standards, making it a reliable option for your engine rebuild or upgrade. The valve's construction ensures durability and longevity, allowing for improved performance under high-stress conditions.
The Manley 11577-1 valve is designed to fit a variety of applications, especially in performance-oriented vehicles. It’s a universal fitment product, but it’s always a good idea to double-check your specific vehicle requirements to ensure compatibility.
Note: Customers are encouraged to perform due diligence regarding their vehicle's application to confirm this valve will work for their needs.
Users have praised the Manley 11577-1 exhaust valve for its excellent performance and reliable construction. Many highlight the noticeable improvements in engine responsiveness and sound quality after installation. Here are a few excerpts from satisfied customers:
This product comes with a Prop 65 warning. Please ensure to review the safety guidelines associated with its use.
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Manley Performance, formerly called Manley Speed Equipment, was established in 1966 by Hank Manley shortly after his graduation from Brown University. His interest in the performance and racing traced back to 1960 when, at age 17, he rebuilt a 312 CID Ford V8 engine, installed a camshaft and three two-barrel carbs, and raced a ’56 Thunderbird on New Jersey’s streets. Initially, the company’s product lineup included stainless valves, lifters, camshafts, forged pistons, vanadium valve springs, pushrods, and timing chain kits. By 1998, Manley had outgrown its first Bloomfield, New Jersey facility and bought several acres in Lakewood, New Jersey. It was around this time that the brand’s name formally changed to Manley Performance. Nearly a decade later, the production space doubled in size.
Evolving in the Automotive SpaceLed by GM Michael Tokarchik in 2002, Manley entered the high-performance passenger car market as an OEM supplier of connecting rods for the 2003/2004 Ford SVT Mustang Cobra. Production reached 2500 rods per week without missing a single delivery date. Ford awarded Manley its highest ever supplier rating. Manley’s presence in the OEM market continued from there as a supplier for the Ford GT. After nearly 50 years since its inception, Manley continues to be globally recognized as the leading manufacturer of performance valves, connecting rods, cylinder head components, pushrods, drive and oil systems, and several other engine parts.
What is Manley’s Specialty?Manley Performance specializes in high-performance engine internals that range from stock replacements to full-on race applications. They have been the standard of the industry since their inception; a fact that still remains true now as they have ventured into new markets. Today, Manley Performance continues to re-define itself in a high-performance aftermarket industry that is constantly evolving. The brand has developed a wide range of new products for growing markets that include sport compact, Ford modular, and Chevy LS. Manley also maintains its leadership role with the traditional V8 engine business.
Get Manley Performance at Vivid RacingIf you are in need of a serious upgrade to your engine, then Manley Performance parts should be on your list. Like all of our suggested manufacturers, Manley uses the best materials available to ensure a quality part for your engine. We carry Manley connecting rods, crankshafts, pistons, and valve components. The large lineup of domestic parts includes sport compact vehicles, Ford modular engines, GM’s LS series internals, and HEMI product upgrades for Chrysler.
If you can’t find what you’re looking for or need help choosing the right part for your car, call our sales team at (480) 966-3040. We are here to make your buying experience a breeze.