STK Performance Nissan A14/A15 Dual Valve Springs – Materials, Benefits, and Performance Insights
When pushing the limits of classic Nissan A-series engines such as the A14 and A15, the right valve train components become essential. Whether it’s for motorsport, spirited street use, or turbocharged setups, STK Performance dual valve springs are engineered to offer exceptional control, durability, and reliability at high RPMs — exactly what these engines need when taken beyond stock limits.
Why Choose STK Performance Dual Valve Springs for A14/A15?
STK Performance has developed purpose-built dual valve springs specifically for A14 and A15 engines. These springs are designed to work seamlessly with both OEM and aftermarket cylinder heads, particularly in high-performance or high-RPM builds.
Eliminates Valve Float at High RPM
Valve float is a major risk at elevated engine speeds. STK’s dual spring setup offers the seat and open pressure necessary to maintain full valve control, especially when using upgraded camshafts or pushing beyond 7000+ RPM.
Camshaft-Compatible
Whether you’re using a mild street cam or a full race cam, STK springs are rated to handle aggressive lift and fast ramp rates without coil bind or loss of spring tension.
Improved Durability
STK’s dual springs reduce the load on each coil, spreading the stress and significantly extending operational life — even in demanding motorsport conditions.
Built for Power and Precision
With STK valve springs, A14/A15 engines can safely rev higher, respond faster, and deliver more consistent power without risking valve train instability.
STK Materials & Manufacturing Quality
STK Performance dual valve springs are manufactured from high-grade chrome-silicon steel (Cr-Si), a material widely used in motorsport and racing programs. This alloy is:
- Heat-treated for superior fatigue life
- Shot-peened to reduce micro-stress cracks
- Ground to tight tolerances for perfect install height and load rates
- Designed to resist sagging under high heat and pressure
Perfect Match For:
- Naturally Aspirated A14/A15 builds using performance cams
- Turbocharged A-series setups needing tight valve control under boost
- Historic racers, track-day cars, and autocross vehicles
- Street-performance conversions seeking long-term reliability
Pair With Other STK Performance Components
For a full valve train solution, STK Performance also supplies:
- High-lift performance camshafts for A-series engines
Together, these components form a cohesive system, designed and tested for compatibility and performance.
Why STK Performance?
STK Performance is known for their uncompromising approach to engineering, materials, and application-specific development. Every part is built with performance, longevity, and reliability in mind — especially important for vintage motors where failure can mean costly rebuilds or part sourcing challenges.
Conclusion: Unlock Your A-Series Engine’s Potential
For anyone looking to upgrade the Nissan A14 or A15 engine, STK Performance dual valve springs are a must-have. With modern materials, motorsport-level durability, and compatibility with high-performance camshafts, STK delivers a professional solution to a critical part of engine performance.
Don’t let valve float or weak springs hold back your build — trust STK to keep your A-series engine sharp, responsive, and reliable all the way to the redline.