C8 1976 81 PASSENGER ENGINE STAMPING INFORMATION THE ENGINE PLANTS WILL STAMP A SOURCE PRODUCTION DATE AND TYPE DESIGNATION ON THE ENGINES AS SHOWN BELOW 4 CYLINDER 140 CID STAMPED OPPOSITE THE NUMBER THREE CYLINDER ON THE RIGHT SIDE OF THE CASE ON THE LEFT SIDE OF THE PAD AS CLOSE TO THE REAR OF PAD AS POSSIBLE ALL 6 CYLINDER STAMPED ON CRANKCASE ON RIGHT HAND SIDE OF ENGINE TO REAR OF DISTRIBUTION NOTE 1978 6 CYLINDER STAMPED ON RIGHT OR LEFT HAND REAR EDGE OF CYLINDER CASE ALL 8 CYLINDER EXCEPT MARK IV STAMPED ON TOP FRONT OF RIGHT HAND BANK OF CYLINDER AND CASE AS CLOSE AS POSSIBLE TO UPPER END OF PAD ALL MARK IV STAMPED ON TOP OF RIGHT HAND BANK OF CYLINDER AND CASE AS CLOSE AS POSSIBLE TO LOWER END OF PAD F WILL DESIGNATE FLINT MOTOR V FLINT ENGINE T TONAWANDA S SAGINAW PARTS K GIVI OF CANADA LTD M GM OF MEXICO AND H HYDRAMATIC THE FOUR DIGIT NUMBER FOLLOWING THE SOURCE DESIGNATION WILL INDICATE THE CALENDAR MONTH AND DAY PRODUCED OF THE FOUR DIGITS THE LAST TWO WILL ALWAYS INDICATE THE DAY I IZ 01 FOR THE FIRST DAY OF THE MONTH 02 FOR THE SECOND DAY ETC THE T NO DIGITS PRECEDING THE DATE PRODUCED WILL INDICATE THE MONTH VIZ 01 FOR JANUARY 02 FOR FEBRUARY AND 12 FOR DECEMBER EXAMPLE JANUARY IST WOULD READ 0101 A STANDARD IHA00 SERIES TYPE IF BLIILT AT TONAWANDA ON JANUARY 1ST WOULD BE STAMPED T O101CLW THE FIRST CHARACTER OF THE TYPE DESIGNATION WILL ALWAYS BE C OR FOR PASSENGER AND T OR A FOR TRUCK NOTE THE ENGINE PLANTS ARE TO STAMP THE SERIAL PAD OF ALL CURRENT MODEL SERVICE ENGINES WITH THE SOURCE PRODUCTION DATE AND THE SAME TYPE DESIGNATION AS STAMPED ON THE COMPARABLE PRODUCTION ENGINE ON IRRIGATION ENGINES A FOUR DIG T SEOUENTIAL SERIAL NUMBER BEGINNING WITH 1001 FOR EACH ENGINE WILL BE STAMPED ADJACENT TO THE E IGINE DATE STAMP AND WILL INDENTIFY EACH IRRIGATION ENGINE BUILT WAREI IOUSING AND DISTRIBUTION DIVISION OF GENERAL MOTORS CORPORATION CHEVROLET IOZ 21