If you're looking to boost your vehicle's performance, the Manley Valve - Exhaust, Valve-BBC S/D 1.940 is a fantastic choice. Designed specifically for high-performance applications, this exhaust valve is engineered to fit a variety of Big Block Chevy (BBC) engines, making it a go-to component for enthusiasts and professionals alike.
This exhaust valve is crafted with precision to provide excellent sealing and durability under high temperatures and pressures. The 7-degree dish on the top of the head enhances airflow, contributing to improved engine efficiency. With a stem diameter of 0.311 inches, it fits snugly into your engine, ensuring reliable operation. Whether you're racing or just looking to improve your vehicle's capabilities, this valve is an essential upgrade.
While the Manley Valve 12803-1 is designed for universal fitment with Big Block Chevy engines, we recommend that you double-check compatibility with your specific vehicle model. This ensures that you get the best performance and fit without any hassles.
Users have praised the Manley Valve 12803-1 for its reliability and performance. Many noted significant improvements in engine response and overall power. Customers appreciate the durable construction and precision engineering that Manley is known for, making it a trusted choice for both everyday drivers and performance enthusiasts.
Choosing the right exhaust valve is crucial for optimizing your engine's performance. The Manley Valve - Exhaust, Valve-BBC S/D 1.940 not only meets high-performance demands but also fits seamlessly into your engine setup. Upgrade today and experience the difference!
⚠ 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.