STK Racing Dual Valve Spring Kit + 6mm Chromoly Retainers   Honda B-Series & VTEC When building a high-revving Honda B-Series or VTEC engine, the valvetrain becomes one of the most critical components in the entire setup. The STK Racing Dual Valve Spring Kit with 6mm chromoly retainers is designed

Upgrade Your 2.0 16V the Right Way   If you’re building or refreshing a VW ABF 2.0 16V motor, the valvetrain is not the place to cut corners. Whether you’re running hotter cams, increasing compression, or planning forced induction, the Dual Valve Spring & Valve Kit for VW ABF is

When building a serious Volkswagen or Audi 1.8T 20V engine, most enthusiasts focus on turbo size, injectors, intercoolers, and tuning. But one of the most critical components in any high-performance setup sits inside the cylinder head: the valve springs. The Racing Valve Spring Kit for the 1.8T 20V is not

When building a performance-focused Volkswagen 8-valve engine, your valvetrain setup can make or break the build. Whether you’re chasing higher RPM, running an aggressive cam, or building a boosted setup, upgrading your valve springs is essential. The STK Performance Dual Racing Valve Spring Kit for VW 8v engines is designed

When building a BMW M20 engine — whether for spirited street driving, high-revving track use, or a full race application — the valvetrain is one of the most critical areas to address. The STK Racing Valve Spring Kit (7mm) is designed to significantly improve valve control compared to stock springs,

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