COMP Cams hardened ID spring locators provide an inboard locating shoulder to center and retain valve springs under extreme pressures and high RPM. The 4773-style seats have a 1.540" OD and .640" ID and are designed to work with COMP Cams dual valve springs such as 932, 935 and 26094, reducing head machining and improving spring stability compared with older external cups.
COMP Cams ID Spring Seats 1.5 X 630 X