1.260 Pro H-11 Single Valve Springs

The 1.260 Pro H-11 Single Valve Springs from Manley are designed for high-performance engine builds where reliability and precise valve control are essential. This set of 16 springs is ideal for builders and engine tuners who require OEM-quality construction combined with performance specifications that surpass stock parameters. Whether for naturally aspirated strokers, bracket racing engines, or street performance platforms, these single springs provide the consistent load rates and durability necessary for sustained high-RPM operation.

Each 1.260 Pro H-11 Single Valve Spring features a spring rate of 370 lb/in and a coil bind of 1.095 in, which are critical for establishing predictable valve timing and preventing valve float across the RPM range. The 1.260-inch outer diameter is compatible with standard cylinder head configurations, while the construction ensures minimal harmonic distortion and fatigue resistance through numerous combustion cycles. Manley's manufacturing process maintains tight tolerances on wire diameter, coil pitch, and free length, eliminating the variance common in budget alternatives.

This spring set is suitable for applications requiring single-spring configurations on H-pattern cylinder heads, offering compatibility across both domestic and import engine platforms with standard valve spring bores. Builders looking for reliable performance in demanding conditions will find these springs to be an excellent choice for their engine tuning needs.