Manley 42315S-1 Performance Valve Spring Single

The Manley 42315S-1 is a high-performance valve spring engineered for demanding engine builds where consistent valve control and durability are essential. Manley Performance is a trusted name in the motorsports and high-performance aftermarket industry, manufacturing precision valvetrain components that meet the rigorous demands of race and street performance applications.

Manley valve springs are manufactured from premium-grade, heat-treated chrome silicon wire, ensuring superior fatigue resistance and long service life even under extreme RPM and temperature conditions. Each spring is shot-peened and preset to maintain accurate installed height and spring rate over extended use.

Key Features:

• High-strength chrome silicon wire construction for enhanced fatigue resistance
• Shot-peened surface treatment to relieve stress and extend spring life
• Preset to maintain consistent installed height and load rates
• Precision-wound for uniform spring rate and reliable valve control
• Designed for high-RPM performance and racing applications
• Compatible with performance camshaft upgrades requiring increased spring pressure

The 42315S-1 is sold as a single spring, making it ideal for replacement of individual springs or for builders sourcing components in custom quantities. Always verify installed height, coil bind clearance, and seat/open pressure against your specific camshaft profile before installation.