When modifying or rebuilding a Toyota 4A-GE 20V engine, most enthusiasts focus on cams, intake systems, and engine management. One component that often gets overlooked is the valve spring. Yet valve springs play a critical role in how reliably and efficiently your engine performs—especially at high RPM. Understanding the difference between OEM valve springs and […]
OEM vs STK Racing Single Valve Spring Kit – Toyota 4AGE 20V Read Post »
Introduction Valve springs are one of the most critical components in any engine, directly affecting airflow, RPM capability, and long-term reliability. On Nissan’s classic A-series engines — the A14 and A15 — the factory (OEM) valve springs were designed for low to moderate RPM daily driving. They were never intended for high-performance use. As soon
OEM vs STK Dual Racing Valve Spring Kit – Nissan A14/A15 Read Post »
BMW M52 owners modify their engines for one reason: the platform rewards it. Whether the goal is sharper throttle response, more power at redline, or a reliable boosted setup, the M52 is capable — but only if the valve train can maintain control at high speed and high load. The STK Racing Dual Valve Spring
STK Racing Dual Valve Springs for BMW M52 — Built for High RPM and Boosted Pressure Read Post »
For years, a common misconception has circulated in the tuning world: “Camshafts don’t make a difference on turbocharged engines.” At STK Performance, we’ve proven that statement wrong. With the release of our 252/262H camshaft set, we’ve shown clear, measurable gains backed by dyno results – not theory. Why Turbo Engines Benefit from Cams Turbocharged engines already force more
Turbo Camshaft Upgrades – Why They Work Read Post »
Bring your classic VW 8-valve to life with a valvetrain package engineered as a system. STK Performance offers VW 8v camshaft kits in both hydraulic and solid lifter configurations—paired with forged performance valves, racing valve spring kits, and chromoly retainers. Choose a complete, drop-in bundle or mix-and-match individual component kits to build exactly what your engine and goals demand. Why upgrade the
STK Performance VW 8v Hydraulic & Solid Lifter Camshaft Kits Read Post »
The Ford Kent engine—a legendary powerplant found in everything from classic Escorts and Capris to Formula Ford race cars—has earned a reputation for being robust, tuneable, and high-revving. For enthusiasts looking to push this engine further, upgrading the valve train is essential. One of the most critical components in that process is the valve spring,
STK Performance Dual Valve Springs for Ford Kent Engines Read Post »
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
The Mazda FE3 16-valve engine is a solid platform for naturally aspirated or turbocharged performance builds. Known for its strong bottom end and high-flow cylinder head, the FE3 responds incredibly well to tuning. However, pushing it beyond factory limits demands upgrades to the valvetrain—starting with the valve springs. STK Performance offers a high-quality dual valve
The legendary Volkswagen ABF 2.0L 16V engine is renowned for its high-revving nature and motorsport pedigree. Whether you’re building a naturally aspirated screamer or a turbocharged street monster, upgrading the valvetrain is essential for maximizing performance. STK Performance offers industry-leading valve springs and forged performance valves tailored specifically for the ABF platform. Why Upgrade with
STK Performance Upgrades for the VW ABF 2.0 16V – Valve Springs & Performance Valves Read Post »
When building high-performance VAG engines, one critical yet often overlooked component is the valve spring. STK Performance has developed a range of uprated valve spring kits tailored for the demands of turbocharged and naturally aspirated VW/Audi Group (VAG) engines—including the Golf GTI Mk5, Mk6, Mk7 (EA113 & EA888 TFSI platforms), as well as the iconic
