(S42/M42/M50/S50/M52/M54) Type/Material/Application: Dual Spring - Turbo - Special Alloy Outside Diameter: 22.75 mm/29.5 mm Inside Diameter: 17.1 mm/22.75 mm Seat Pressure: 80 lbs @ 36mm Open Pressure: 180 lbs @ 26 mm Rate Inch: 254 lbs Coil Bind: 21 mm Max Net Lift: 14 mm This Spring requires Ferrea Titanium Retainer #E11025 and Ferrea Spring Seat Locator #SL1021 (Discard OEM Spring Seat Locator).
(S54) Type/Material/Application: Dual Spring - Endurance - Special Alloy Outside Diameter: 20.8 mm/28.0 mm Inside Diameter: 16.51 mm/20.8 mm Seat Pressure: 85 lbs @ 41 mm Open Pressure: 185 lbs @ 31 mm Rate Inch: 254 lbs Coil Bind: 26.5 mm Max Net Lift: 14.0 mm This Spring requires Ferrea Titanium Retainer #E11128 and Ferrea Spring Seat Locator #SL1141 (Discard OEM Spring Seat Locator). Type/Material/Application: Dual Spring - Endurance - Special Alloy
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