The Valve Spring and Retainer Kit will allow the Subaru STI to run a higher-lift camshaft.

Manley Performance Valve Spring and Retainer Kit

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Specs:

• Single conical ovate wire type
• Outer Diameter: 1.050"
• Inner Diameter: .755"
• Pressures: 60 @ 1.420" / 151 @ 1.050" / 187 @ .895"
• Stock Net Lift: .370"
• Maximum Net Lift" .525"
• Coil Bind: .845"
• Includes (16) valve springs
• Includes (16) aerospace-grade titanium retainers

Manley Performance Valve Spring and Retainer Kit

The Manley Performance Valve Springs and Retainers are ideal for those of you with upgraded camshafts, or who are planning on building your heads to accept high-lift camshafts. These springs will sustain the stress of increased lift and high revs and are required when building your engine to make big power numbers. These valve springs will include aerospace-grade titanium retainers and will come as a complete set, and make for an excellent upgrade for those of you who are getting work performed on your heads.