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PAC RPM Series Stage 3 .550" lift GT500 Springs

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Calculated at checkout

Product Description

Intake Spring
120lbs @ 1.715" 
280lbs @ 1.165"
Max Lift .550" 
Coil Bind @ 1.090" 

Exhaust Spring
120lbs @ 1.575" 
280lbs @ 1.025" 
Max Lift .550" 
Coil Bind @ .952"

These PAC Racing RPM Series Valve Springs are Specifically Designed for the Ford GT / Shelby GT 500 Cylinder Heads. These Heads use different installed heights and until these springs were released, the only option was to use +.060" Retainers and Shims to get close to the same pressure between the intake and exhaust. PAC has now manufactured 2 seperate springs with different installed heights that have the same seat pressures, open pressures and spring rates. These Springs go through multiple strengthening and anti fatiguing processes to ensure you are getting the most reliable valve springs possible. Designed to fit the factory retainers and spring seat / seals. We also have 4130 Chrome Moly and Titanium Retainers made for these springs should you want to upgrade the retainers as well.  

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