Supertech Subaru EJ20/25 58lbs/36mm Dual Spring Kit

This Supertech dual spring kit is built for Subaru EJ20 and EJ25 engines, featuring springs rated at 58 pounds of seat pressure at 36mm. This specific spring rate is chosen to handle higher lift camshafts and increased RPMs, making it a solid choice for performance builds where the stock springs can't keep up. The dual spring design offers improved stability at high engine speeds, helping to prevent valve float and ensure consistent valve train operation. This kit is designed to work with stock valve sizes, but it's important to note that when upgrading camshafts, matching the valve springs to the cam's specifications is crucial for optimal performance and engine longevity. The springs are made from high-tensile wire, a well-built material that can withstand the stresses of aggressive engine use.

When you're rebuilding the top end of your EJ20 or EJ25, especially if you're aiming for more power or higher rev limits, selecting the right valve springs is a critical step. These Supertech springs are a popular option because they offer a significant upgrade over factory components without requiring extensive modifications to the cylinder head. The dual spring setup provides an extra layer of security against valve float, which can lead to serious engine damage if not controlled. This kit is intended for enthusiasts who are pushing their Subaru engines beyond stock performance levels and need a valve train that can reliably handle the increased demands.

This kit includes the necessary dual valve springs. It's important to consult your camshaft manufacturer's specifications to ensure compatibility with these springs, particularly regarding maximum lift and recommended seat pressure. Proper installation, including checking valve-to-piston clearance and using appropriate spring compressors, is essential for a successful build. If you're unsure about any aspect of the installation or compatibility, it's always best to consult with a qualified mechanic.