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The COMP Cams inboard ID spring seat centers and secures valve springs with hardened steel construction to withstand extreme spring pressures and high RPM. The 4771 features a 1.550" OD and a .570" ID and is compatible with COMP Cams 925 and 939 dual valve springs. Its internal locating shoulder reduces the need for head machining while protecting the head and shim.
COMP Cams ID Spring Seat 1.5 X 570 X 69
