These are the Brian Crower Steel Spring and Retainer Kit. These have been designed for those of you who are adding more power and boost, where your engine will be revved to high RPM's and need a strong valve spring to sustain consistent pressures. 

• Wound from only the highest grade super clean chrome silicone alloys
• Feature proprietary processing procedures for consistent pressures
• Ideal for those adding aggressive cams
• Ideal for those adding more boost and more power
• Includes (16) valve springs
• Includes (16) retainers