• Valve spring set, EJ20/EJ25, 1.126/.640 dimensions, 16 pieces
• Matched specifically to 23185-16 retainers
• Larger spring supports more aggressive camshaft profiles
• Full set for a complete engine

A Larger Spring, Matched to Its Own Retainer

This 1.126/.640 Manley valve spring set is matched specifically to Manley's 23185-16 retainers, a different pairing than the smaller 1.050/.755 series and its 23180-16 retainer. That larger spring size supports more aggressive camshaft profiles and higher lift than the smaller series can handle, making it the right choice once you've stepped up to a genuinely aggressive cam. Getting the spring and retainer combination correct is critical to avoiding valve float or spring coil bind at higher RPM. That's exactly the kind of thoughtful design worth paying for.

A Full Set of 16 for a Complete Engine

This set includes all 16 springs needed for a complete EJ20/EJ25-based engine, rather than requiring you to piece together individual springs and hope they're consistent. Matched springs across all cylinders is what keeps valve behavior consistent engine-wide rather than having one cylinder behave differently than the rest. It's the correct spring choice specifically when paired with Manley's matching 23185-16 retainer part number. For a component this critical, that level of engineering is worth having.

Straight From Subispeed

The correctly matched, larger valve spring set for 2002-2012 WRX / 2004-2012 STI when paired with Manley's 23185-16 retainers — confirm your retainer part number before ordering.

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