When it comes to performance and reliability in your engine, the Manley Valve Lock/Keeper, LOC-5/16 MACHINED is a fantastic choice. This product is designed to fit snugly and securely, ensuring that your engine operates smoothly. Whether you're working on a domestic vehicle or a performance build, this valve lock is engineered to meet your needs.
This valve lock is crafted with precision, ensuring a perfect fit for your engine components. Its machined design enhances durability, providing peace of mind during high-performance applications. With the LOC-5/16, you can expect:
This product is designed to fit a variety of domestic vehicles. It is recommended to verify your specific application to ensure optimal performance. The LOC-5/16 is a universal fitment, but checking compatibility with your engine setup is always a wise move.
Customers have praised the Manley Valve Lock for its reliability and ease of installation. Many users have noted that it provides a solid fit without any concerns of loosening under high RPM conditions. Here’s what some satisfied customers have to say:
"Installed these in my engine rebuild, and they fit perfectly. No issues at all!"
- Satisfied Customer
"Great quality and a solid lock. I feel confident in my engine's performance now!"
- Happy Mechanic
If you're looking for a reliable valve lock that won't let you down, the Manley Valve Lock/Keeper, LOC-5/16 MACHINED is an excellent choice. Its robust construction and universal fit make it a go-to for many automotive enthusiasts. Make sure to check your specific vehicle application to reap the full benefits of this high-quality product!
⚠ 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.