Brand new MANLEY NexTek Series Drag Race Valve Spring Set Of 16 Part Number 221424-16 Manufactured From Super Clean Hi Tensile Chrome Silicon Steel Tip Thickness Designed To Eliminate Overload Breakage Shot Peened To Mil Spec For Maximum Fatigue Life Specs : Maximum Valve Lift : .880" Outside Diameter : 1.640" Inside Diameter : .860" Installed Pressure : 250 Lbs @ 2.000" Open Pressure : 800 Lbs @ 1.150" Rate - Lbs / Inch : 647 Lbs Coil Bind At : 1.070" Weight - Grams : 149 Dual Spring - No Damper Ideally Suited For Sportsman Drag Racing Applications
