1.274 Dual Valve Spring GM LS (1)

The 1.274 Dual Valve Spring for GM LS engines is a high-performance component designed for serious engine builders and performance enthusiasts looking to exceed stock horsepower limits. This spring setup is particularly beneficial in high-RPM applications where valve float can become a critical issue, ensuring stability and control at elevated speeds.

Manufactured by PAC Racing Springs, this dual valve spring is crafted from premium spring steel, providing consistent load rates throughout the valve lift range. The 1.274-inch outer diameter is optimized for LS head geometry, allowing for proper clearance while maximizing spring force. The dual design, featuring inner and outer coils, effectively shares load transmission, reducing harmonics and enhancing spring longevity compared to single springs.

Engine builders working with LS1, LS2, LS3, and LS-based crate motors will find these dual valve springs essential when upgrading to aftermarket camshafts with aggressive lift and duration specifications. Installation requires valve spring compressor tools and careful attention to spring heights to ensure optimal performance.