1.400 Dual Valve Springs Nek Tek Series

The 1.400 Dual Valve Springs Nek Tek Series by MANLEY are precision-engineered components designed for serious engine builders and performance enthusiasts who demand reliability under extreme valve train stress. These dual valve springs represent the evolution of high-lift, high-RPM cylinder head technology, engineered to maintain consistent spring pressure across a wide rpm band without sacrificing durability. Built for naturally aspirated and forced induction applications, they're the foundation of any stroker, turbo, or supercharged build that requires controlled valve actuation and consistent seating force.

The 1.400-inch outer diameter profile of these dual valve springs allows for increased installed height and seat pressure while maintaining a compact envelope compatible with most OEM and aftermarket cylinder heads. MANLEY's Nek Tek Series utilizes premium alloy steel with controlled rate geometry, preventing coil bind and ensuring predictable spring force delivery from idle through maximum valve lift. The dual-spring configuration distributes load more evenly across the valve seat, reducing fatigue and micro-movement that degrades sealing surfaces. This design maintains consistent preload under thermal cycling, critical for engines operating at sustained high temperatures and boost levels.

These springs suit builders upgrading cylinder heads for big-valve conversions, solid roller camshaft installations, and extended-RPM street and race applications. Compatibility depends on your specific head casting and target cam profile—verify spring pocket dimensions and seat pressure requirements before installation. MANLEY valve springs are industry standard for professional machine shops and are commonly paired with titanium retainers and hardened pushrods in high-performance builds. Installation requires proper spring compressor equipment and should be performed by experienced technicians familiar with valve train geometry and preload specifications.