• Valve spring set, 1.050/.755 dimensions, 16 pieces
• Matched specifically to 23180-16 retainers
• Increased seat and open pressure over factory springs
• Supports higher lift camshafts and higher RPM

A Spring Built to Match a Specific Retainer

This Manley valve spring set is dimensioned at 1.050/.755 specifically to work with Manley's 23180-16 retainers, ensuring correct installed height and spring binding clearance rather than guessing at compatibility between mismatched brands. Upgrading valve springs becomes necessary once you've installed a higher lift or longer duration camshaft, since factory springs often can't provide enough seat pressure to control the valve at the more aggressive lift and RPM those cams introduce. Getting the spring and retainer combination correct is critical to avoiding valve float or spring coil bind. It's the kind of upgrade that quietly does its job without ever needing a second thought.

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 23180-16 retainer part number. That's real, functional engineering, not just a marketing claim.

Straight From Subispeed

The correctly matched valve spring set for 2002-2012 WRX / 2004-2012 STI when paired with Manley's 23180-16 retainers — confirm your retainer part number before ordering.

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