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Spring load at 1.64" 127lbs
Spring load at 1.040" 303lbs
Spring rate 293 lbs per inch
Coil bind 1.000"
Max Lift .600"
Performance .600" lift boost springs with higher seat pressure for high boost applications. Springs include custom retainers as the stock retainers will not work very well with these springs. Drop in replacement, no machining necessary. Fits stock seals. Higher seat pressure is recommended for higher boost (+20PSI) blower and turbo applications. Springs are surfaced treated for high durability. Made in the USA.