Ferrea E11066-1 K20 Double Spring 7 Degree Pro CNC Titanium Valve Spring Retainer

The Ferrea E11066-1 is a precision CNC-machined titanium valve spring retainer designed for dual valve spring setups using a 7-degree keeper/lock taper. Engineered for high-performance and racing applications, this retainer is machined from aerospace-quality titanium alloy to deliver maximum strength at significantly reduced weight compared to steel alternatives—critical for reducing valvetrain mass and enabling higher RPM operation without valve float.

This retainer features a 5.5 mm valve stem bore, an outer diameter (A) of 27.10 mm, and an inner step diameter (C) of 17.35 mm, making it a precise fit for dual spring configurations on the Honda/Acura K20 engine platform. Each piece is finished to exact dimensional tolerances to ensure proper spring seat contact and consistent valvetrain geometry.

Key Features:

• Pro CNC machined from aerospace-grade titanium alloy
• 7-degree keeper seat for use with standard 7-degree valve locks
• Designed for dual valve spring configurations
• Valve stem bore: 5.5 mm
• Outer diameter (A): 27.10 mm
• Inner step diameter (C): 17.35 mm
• Sold individually (single retainer)

For a complete valvetrain upgrade, Ferrea recommends pairing the E11066-1 with Ferrea dual valve springs S10099 or S10100 and Ferrea valve locks K10034. This retainer is manufactured to the same exacting standards used in Ferrea's Formula 1, NASCAR, and Indy Car racing programs, making it equally suited for street performance builds and all-out race engine builds.