Manley 221436-1 NexTek Double Valve Spring 1.295" OD LS-Series

The Manley 221436-1 is a NexTek high-performance double valve spring designed specifically for GM LS-series engines, featuring a 1.295" outer diameter, 0.676" inner diameter, and a 379 lbs./in. spring rate with 155 lbs. at 1.810" installed height and 405 lbs. at 1.150" open height. Developed over a decade ago, these NexTek valve springs offer unequaled performance and are able to satisfy the demands of top-level engine builders who need the absolute highest-quality valve springs available.

Key Specifications:

• Application: GM LS-series engines
• Outer Diameter: 1.295"
• Inner Diameter: 0.676"
• Spring Rate: 379 lbs./in.
• Installed Height/Pressure: 155 lbs. @ 1.810"
• Open Height/Pressure: 405 lbs. @ 1.150"
• Maximum Valve Lift: 0.660"
• Coil Bind: 1.100"
• Type: Double spring without damper
• Quantity: Sold individually (1/pkg)

Performance Features:

• Manufactured from super-clean, high-tensile chrome silicon steel and shot-peened to MIL specs for maximum fatigue life
• Proprietary, multi-step heat-treating that minimizes load loss with computer-aided modeling to minimize valve bounce and valve gear separation
• Smaller diameter and lightweight design allows engines to rev higher faster, with extended tip thickness designed to eliminate overload breakage and tightly controlled open-end flatness to reduce valve stem side loading
• Specially processed premium-grade chrome silicon that is virtually free of impurities or surface irregularities

Manley NexTek springs can be found in drag race applications ranging from Bracket racers to Top Fuel, oval track engines across the country, and muscle cars on the street and strip. This is a professional-grade component ideal for high-performance builds, street/strip applications, and racing engines requiring reliable valvetrain control at elevated RPM.