Supertech Subaru EJ20/25 64lbs/36mm Dual Spring Kit

This is the Supertech dual valve spring kit for Subaru EJ20 and EJ25 engines, specifically designed for the STI models. If you're rebuilding the top end of your high-performance Subaru engine, especially if you're planning on more aggressive camshafts or increased boost pressure, these springs are a critical component. They are built to handle the demands of higher RPMs and increased cylinder pressures that come with performance modifications, ensuring your valves close reliably under stress.

This kit features dual springs, meaning each valve gets two springs working together. This setup offers improved stability at high RPMs and helps prevent valve float, a condition where the valve train can't keep up with the camshaft's speed, leading to potential engine damage. The springs are rated at 64 pounds of seat pressure and 36 millimeters installed height, which are key specifications for ensuring proper valve control with many performance camshaft profiles commonly used in EJ20 and EJ25 builds. Supertech is known for using well-built materials and advanced manufacturing processes to create components that can withstand the rigors of performance applications.

When undertaking a valve spring replacement, it's important to have the right tools and knowledge. You'll typically need a valve spring compressor tool that's compatible with your engine's cylinder heads, and it's often recommended to have a way to keep the valves from falling into the combustion chamber, such as compressed air or a string method. This kit includes the dual springs, but you'll want to confirm if retainers, valve seals, or other associated hardware are needed for your specific build, as they are not always included in spring-only kits. Consulting your engine build plan or a trusted mechanic will help ensure you have everything necessary for a successful installation.