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When building or upgrading a high-performance Ford Duratec engine, one of the most critical yet often overlooked components is the valvetrain—specifically, the valve springs. The STK Single Valve Spring Kit for Ford ST150/170 is designed to handle the increased demands of modified engines, ensuring reliability, stability, and performance at high RPM. Product Overview The STK […]

When building or upgrading a performance engine—especially something like a Mazda MPS—most people focus on the obvious: bigger turbos, aggressive tuning, and upgraded fueling. But one of the most critical components is often overlooked: the valvetrain. More specifically, the valve springs. The STK Performance Single Valve Spring Kit for Mazda MPS is designed to solve

When it comes to pushing the legendary Nissan SR20 engine beyond factory limits, most builders focus on turbos, fuel systems, and tuning. But one of the most overlooked — and most critical — components in a high-performance engine is the valvetrain. And more specifically… the valve springs. If you’re chasing higher RPM, bigger cams, or

When it comes to performance and reliability, most enthusiasts focus on big upgrades—cams, turbos, injectors. But often, the real problem lies in the smallest components. In the case of VW 16V engines, one of the most overlooked culprits behind poor performance, noise, and long-term engine damage is the cam follower. And more importantly—the right hydraulic

BMW engines are known for their balance of performance, refinement, and engineering excellence. Platforms like the M20, M30, M50, M52, and M54 have become favourites among enthusiasts for builds ranging from daily drivers to full race cars. But once you start pushing beyond factory limits, a reality sets in: OEM components were never designed for

When it comes to classic builds and performance upgrades, the Ford Pinto engine has earned its place as a reliable and tunable platform. But there’s one common issue that continues to catch enthusiasts off guard — valve spring failure. It’s not always obvious at first. In fact, many drivers only realize something is wrong once

When building or upgrading a VW 8-valve engine, most people focus on the obvious performance upgrades: camshafts, ported cylinder heads, turbo systems, or ECU tuning. But there is a critical component in the valvetrain that is often overlooked — the valve springs. A high-performance camshaft or high-RPM build can quickly expose the limitations of factory

At 32 years old, Ruan Oosthuizen is steadily making his mark in the drifting scene with his BMW E46 M52B28 Turbo, a car built with passion, persistence, and a love for motorsport. Like many great builds, this one started during lockdown. What began as a project quickly evolved into something much bigger. Ruan started building

For many Opel Corsa enthusiasts, the engine is reliable, affordable to maintain, and fun to drive. However, once the excitement of a stock motor wears off, many owners begin to notice a common limitation: the engine simply doesn’t deliver the power, throttle response, or high-RPM excitement that performance drivers crave. Whether you’re building a spirited

In the competitive world of 1660 TinTops oval racing, every component inside the engine plays a critical role in reliability and performance. For Raynard Schoeman’s #57 TinTops race car, one of the key components ensuring the engine performs consistently under race conditions is the use of STK valve springs in his Nissan A14 engine. Why