The Manley Valve - Exhaust, Valve-HEMI 6.4 R/M 1.654 B/L is designed to deliver exceptional performance for your HEMI 6.4L engine. Whether you're hitting the track or just cruising, this valve ensures your engine breathes efficiently, optimizing power output and enhancing your driving experience.
This valve is engineered for the automotive industry, specifically tailored for domestic applications. With a robust design featuring a 20-degree dish on the top of the head and a well-optimized underhead radius of 1/2 inch, it offers reliability and performance. The valve's stem diameter and length are designed to fit seamlessly into your engine, ensuring a perfect fit and function.
The Manley 12331B-1 valve is compatible with various HEMI 6.4L engines, making it a versatile choice for performance enthusiasts. It's important to verify fitment with your specific vehicle model to ensure optimal performance. This valve is designed to work universally, but we recommend checking your engine specifications to confirm compatibility.
Many customers have praised the Manley Exhaust Valve for its reliability and performance. Here’s what some of them have to say:
"Installed this valve on my 6.4L HEMI and noticed a significant improvement in throttle response. Highly recommend!"
"Great quality and fit. My engine runs smoother and I can feel the difference in power!"
Universal Fitment: While this valve is designed for versatile fitment, we advise customers to conduct thorough research regarding their specific application to ensure compatibility with their vehicle.
⚠ 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.