Chevy LS Spring Kit 1.295 w/chromoly retaine

The Chevy LS Spring Kit 1.295 w/chromoly retainer from MANLEY is a precision valve spring assembly engineered for GM LS-series engine builders and performance enthusiasts. This dual-spring configuration delivers the high spring rates and reliability required for forced-induction, nitrous, or high-RPM naturally aspirated applications. Whether you're building a street engine, track car, or dedicated competition platform, this kit provides the valve control and durability needed to safely manage aggressive camshaft profiles and elevated boost or cylinder pressures.

This spring kit features a 379 lb/in spring rate paired with a 1.100-inch coil bind specification, ensuring consistent valve seating and preventing coil stack under peak load conditions. The 1.295-inch outer diameter (OD) design fits LS-series cylinder head bores without modification, while the chromoly retainer provides superior strength and fatigue resistance compared to stock steel components. The dual-spring architecture resists surge and maintains precise valve timing across the entire RPM band, critical for maximizing power output while protecting valve train components from mechanical damage.

Engine builders, tuners, and performance shops standardly specify this kit for LS1, LS2, LS3, LS6, LS7, LSA, and LS9 applications requiring enhanced valve control. Installation requires removal of stock springs and seating the new assembly onto existing LS valve stem seats; no modifications to cylinder head or rocker components are necessary. The 4.92-pound kit weight reflects the substantial materials and precision manufacturing built into every component. For buyers seeking a proven, race-tested valve spring solution for LS engine builds, this MANLEY assembly delivers OEM quality with performance-grade specifications.