This Ferrea spring set requires the Titanium Retainer Set and spring seat locator (OEM spring seat locator is not used)

These new valve springs are designed for higher rev's and more powerful 7M's. If you are building a strong motor, then we have the components for you. Premium-grade alloy, which features special thermal treatment. The advanced spring design and material specifications provides a uniform load & stress distribution even in the most extreme racing environment. This New Valve Spring offers customers additional durability in all high revving applications at an affordable price.

These require our Titanium retainers to seat and maintain sealing (available in the engine section)