Must-Have for Your Next Engine Build or Spring Upgrade - Production tolerances in cylinder heads, valve lengths, valve springs, retainers and locks can impact the valve spring installed height from valve to valve, greatly impacting spring seat and open pressures. COMP Cams spring shims are a must-have to ensure precise installed height on intake and exhaust valves. Race Tough - COMP Cams valve spring shims are not only made from the highest quality shim stock available, they are also heat treated to withstand the most radical camshaft profiles. 1.645" Outside Diameter, 0.650" Inside Diameter. Includes 16 0.060" Thick Shims. Recommended for use with our 998, 951, 991, 996, 946, 7245, 947, 948, 26082 and 26028 springs. Available in an assortment pack under part number 4756. Made in USA
