.062″ thick; with ”ears”. Fits against the crankcase; behind camshaft. This is the locked ”early” 58-90 model for which a separate thrust washer shim is used to achieve correct camshaft end-play. It is also used in virtually all aftermarket 58-99 single cam engines. Note: For 91-99 OEM cases the MCS 906636 thrust washer is used; which is not ”locked” since it has no ”ears”. For this thrustwasher shims for correct end-play cannot be used since the thinnest is already too thick.