COMP Cams Spring Seats For LS 26925Older standard shims will not hold up to the extreme spring pressures and high RPM found in today's engines. COMP Cams offers a simple but effective solution to this problem and a thin, hardened Steel alloy seat which will not only protect the head and shim but will also locate and hold the spring in place. Adding to an already extensive line of locators, COMP engineers have created ones specifically for LS Applications. Catalog User 1