COMP Cams triple valve springs exceed the expectations of today’s engine builders and racers., ., 790 inch maximum lift , 1., 645 inches outside diameter, . Triple Valve Springs: 1.645 OD Outer, .871 ID Middle, .635 ID Inner Valve Springs Comp Cams 947-16 Triple Valve Train Stability Spring Sold in Sets of 16 · Triple Valve Springs · 1.645 in. Outside Diameter · 681 lbs./in. Rate · 1.130 in. Coil Bind Height · Installed Height- 2.00 · Seat Pressure- 260... Engineered from super clean wire and subjected to extensive quality control measures, the triple spring design creates a stronger valve spring that can easily handle the increased lift and extreme demands found in aggressive applications. Triple Valve Spring: 1.645" OD Outer, .871" ID Middle, .635" ID Inner. 947-1. $49.95 ; Triple Valve Springs: 1.645" OD Outer, .871" ID Middle, .635" ID Inner Triple valve springs from COMP Cams deliver maximum strength, durability and valve train stability.