• Single valve spring, EJ20/EJ25, 1.126/.640 dimensions
• Larger spring for more aggressive camshaft profiles
• Increased seat and open pressure over factory springs
• Sold individually

A Larger Spring for More Aggressive Cam Profiles

At 1.126/.640, this Manley valve spring is a larger diameter and different rate than the 1.050 series, built to support more aggressive camshaft profiles and higher lift than a standard replacement spring could handle. Upgrading to a spring like this becomes necessary once you've moved to a genuinely aggressive cam, where factory or mild aftermarket springs simply can't provide enough seat pressure to prevent valve float at higher RPM. Getting the spring rate matched to your specific camshaft's lift and duration is critical for reliable valvetrain operation. That's the kind of detail that separates genuine engineering from a basic replacement part.

Sold Individually for Flexible Ordering

This spring is sold individually, so you'll need to calculate and order the full quantity required for your specific engine configuration. That individual sale approach gives you flexibility if you're replacing a single damaged spring rather than doing a complete valvetrain rebuild. Confirm compatibility with your specific retainer and camshaft combination before ordering. It's a small distinction that makes a real difference once you're actually building the engine.

Straight From Subispeed

A larger, more aggressive single valve spring option for 2002-2005 WRX / 2004-2011 STI — sold individually, confirm compatibility with your camshaft and retainers first.

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