2 SECTION 60 1973 79 TRUCK SERIES l00 500 ENGINE IDENTIFICATION TAG IN ALL INQUIRES ALWAYS FURNISH THE COMPLETE TAG IDENTIFICATION INFORMATION H All engines for l973 include an engine identification tag This tag describes C l D model year year and month of production change level number and engine calibration information The catalog uses the change level number in the same manner as date restriction information is presently used The change level number is advanced only when a replacing part or assembly being introduced and the old part or assembly it replaces are not completely interchangeable All engine code numbers consists of a basic number a suffix and in some cases a prefix Generally the basic number is adequate for engine identification if additional information is needed the prefix or suffix is included These Engine Code Numbers and their designations are listed in the Engine Identification Chart which follows 1973 BEFORE 2 1 73 I973 IEFOIE 2 I 73 its emciue rumcons moouvnn mom cio CH tg Ul lik O svc c M VJ t i e J 3 Til X5 t l a 3 f lives MONTHG nooucnou umunn c ci i a A E Wind r r w Wi d r p elm a aae a a ni chan is i mam me mmm an ia ma mm cawany m only a do not wm mqan museum naw