Competition Cams 986-16 Dual Valve Spring<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Seat pressure: 132 lbs. @ 1.750 inch， Open Pressure: 293 lbs. @ 1.250 inch</li><li>O.D.: 1.430 inch， I.D.: 0.697 inch</li><li>Dual valve springs with damper</li><li>Approximately .540 inch max lift at recommended installed height</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41OQHx1%2BZjL.jpg" noproxy>