"C" head on 140 with no evidence of red paint

ONE way to tell is to look for “C7707” cast into the underside of the exhaust side of the head…it would be in the sand-cast rough area between two of the machined surfaces…either the forward area, or the middle area. From what Roger-Down-Under has found, that late of an engine number SHOULD have a rather large “C” cast into the spark plug valley of the head…can’t miss it.DSCF0143
The next section forward is where the “C7707” is cast on my head…between the flats.DSCF0145

And also is close in engine number to my G5705-8S, BB435, RHC 8, C7707 C3. This head does have ‘C’ cast in the middle of the plug valley.