from the outer periphery 68 of the seal and the supporting protrusion 63 of the annulus when the engine is fully assembled with the seat rings 38 installed as is best shown in fig3 the metal annulus 56 engages the opposing surfaces 18 36 of the retainer and head flange respectively to properly position and support the head and liner assembly and provide the desired bearing material wear element between the facing surfaces at the same time the upper and lower beads 66 67 also engage the opposing surfaces 36 18 to provide a seal against oil entry from the upwardly sloping longitudinal wall 19 and the top deck wing 24 above it recesses 70 on both sides of the beads 66 67 allow flattening of the beads into the space provided without overstressing or excessively setting the resilient seal material thus upon removal for service the seat ring assembly 38 with its integral seal 64 may be reused unless it has been damaged in handling it should be noted that the arrangement of fig2 showing the seat ring 38 in assembled position on the upper surface 18 of the head retainer is not an indication of its proper method.