1968 Evinrude Speedifour, Starflite 85HP Service Manual, Page 46Get this manual
check for flatness, lay sheet of No120 emery cloth surface plate or piece of plate glassPlace the part to surfaced the emery cloth and move slowly back and forth several times in figure motion, exerting evenly distributed, light pressureIf the surface is actually warped or sprung, high spots making contact with the surface plate will take dull polish, while the low areas will have retained their original stateinsure flatness over the entire surface, continue surfacing until the entire gasket surface has been polished to dull lusterFinish surfacing with No180 emery clothSee Figure 5-23NOTE Cylinder block and crankcase must pletely clean of foreign matter prior to reassemblyUse Solvasol for cleaningDO NOT scratch cylinder head gasket surfaces of cylinder WORN RING GROOV ES WARPED RING INSUFFIC ENT GAP RING AND GROOVE
WORN RING ROUNDED EDGE
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LE ING SQUARE GE