PAC Racing Springs HR Series Valve Spring — Dual Spring/Damper

SKU: DHDL_PAC-1940
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About PAC Racing Springs PAC Racing Springs engineers high-quality automotive ...Read More

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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About PAC Racing Springs

PAC Racing Springs engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full PAC Racing Springs lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

PAC Racing HR Series: The Ultimate Valve Spring Upgrade

The PAC Racing HR Series Valve Spring is designed for the performance enthusiast who needs reliable valve control in high-stress environments. Featuring a dual spring and damper configuration, this spring is built to handle the demands of aggressive camshafts while maintaining consistent spring pressure. With a spring rate of 469 lb/in, it provides the necessary force to prevent valve float at high RPMs, ensuring your engine breathes efficiently throughout the power band.

Technical Performance Specs

  • Spring Type: Dual Spring with internal damper to control harmonics.
  • Spring Rate: 469 lb/in for high-performance stability.
  • Coil Bind: 1.120 inch for maximum lift clearance.
  • Outer Diameter: 1.555 inch for standard high-performance head fitment.

The HR Series is a staple in the racing community, known for its ability to resist fatigue and maintain pressure over long service intervals. The inclusion of an internal damper is a key feature, as it effectively manages spring surge and harmonic resonance that can lead to premature failure in lesser springs. Whether you are running a street-strip vehicle or a dedicated track car, these springs provide the stability needed to push your engine to its limits. When you choose PAC Racing, you are choosing industry-leading technology that has been proven on the track. Enhance your engine's reliability and performance with these premium springs from GGCRACING.

Product Details

Product Description
Part Numbers
Sizing & Fit

About PAC Racing Springs

PAC Racing Springs engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full PAC Racing Springs lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

PAC Racing HR Series: The Ultimate Valve Spring Upgrade

The PAC Racing HR Series Valve Spring is designed for the performance enthusiast who needs reliable valve control in high-stress environments. Featuring a dual spring and damper configuration, this spring is built to handle the demands of aggressive camshafts while maintaining consistent spring pressure. With a spring rate of 469 lb/in, it provides the necessary force to prevent valve float at high RPMs, ensuring your engine breathes efficiently throughout the power band.

Technical Performance Specs

  • Spring Type: Dual Spring with internal damper to control harmonics.
  • Spring Rate: 469 lb/in for high-performance stability.
  • Coil Bind: 1.120 inch for maximum lift clearance.
  • Outer Diameter: 1.555 inch for standard high-performance head fitment.

The HR Series is a staple in the racing community, known for its ability to resist fatigue and maintain pressure over long service intervals. The inclusion of an internal damper is a key feature, as it effectively manages spring surge and harmonic resonance that can lead to premature failure in lesser springs. Whether you are running a street-strip vehicle or a dedicated track car, these springs provide the stability needed to push your engine to its limits. When you choose PAC Racing, you are choosing industry-leading technology that has been proven on the track. Enhance your engine's reliability and performance with these premium springs from GGCRACING.

Product Details

Product Description

About PAC Racing Springs

PAC Racing Springs engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full PAC Racing Springs lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

PAC Racing HR Series: The Ultimate Valve Spring Upgrade

The PAC Racing HR Series Valve Spring is designed for the performance enthusiast who needs reliable valve control in high-stress environments. Featuring a dual spring and damper configuration, this spring is built to handle the demands of aggressive camshafts while maintaining consistent spring pressure. With a spring rate of 469 lb/in, it provides the necessary force to prevent valve float at high RPMs, ensuring your engine breathes efficiently throughout the power band.

Technical Performance Specs

  • Spring Type: Dual Spring with internal damper to control harmonics.
  • Spring Rate: 469 lb/in for high-performance stability.
  • Coil Bind: 1.120 inch for maximum lift clearance.
  • Outer Diameter: 1.555 inch for standard high-performance head fitment.

The HR Series is a staple in the racing community, known for its ability to resist fatigue and maintain pressure over long service intervals. The inclusion of an internal damper is a key feature, as it effectively manages spring surge and harmonic resonance that can lead to premature failure in lesser springs. Whether you are running a street-strip vehicle or a dedicated track car, these springs provide the stability needed to push your engine to its limits. When you choose PAC Racing, you are choosing industry-leading technology that has been proven on the track. Enhance your engine's reliability and performance with these premium springs from GGCRACING.

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