LS1 DROP IN .625 LIFT POLISHED & PEENED CHROME SILICONE VALVE SPRINGSCALL SHANON AT 507 445 3235 WITH ANY QUESTIONS. Specifications Part# PAC 1219X PAC 1219 with RPM processing and higher loads O. D. Large End (in) 1. 207 I. D. Large End (in) 0. 885 O. D. Small End (in) 1. 072 I. D. Small End (in) 0. 650 Installed Height (Valve Closed) (in) 145 @ 1. 800 Open Valve (Valve Open) 358 @ 1. 175 Spring Rate 340 Max Coil Bind (in) 1. 100 Max Lift (in) 0. 625 HEIGHT LOAD 2. 200 9 2. 150 26 2. 100 43 2. 050 60 2. 000 77 1. 950