The very best thing you can do for your AMC is join a local club.So I decided to use the internets wayback machine to try and recover the data.
Sometimes its works sometimes it doesnt depends on if there is a robots.txt in the directory or now. All three letters will be present if any part was factory altered from original specifications. If.010 inch over or under would not correct the fit of the part(s), they were replaced. No engine was fitted from the factory with parts that were over.010 inch above or below standard. Willys Jeep Engine Code Represented TheThe code represented the bore (1st letter), main bearings (2nd letter), and rod bearings (3rd letter). In any position, an A indicates standard size, B.010 inch undersize, and C.010 inch oversize. Willys Jeep Engine Serial Number Or EngineWillys Jeep Engine Serial Number OrThe code is located directly below the serial number or Engine Day Build Code on 172-195.6 six cylinder engines, on the boss directly above the oil filter on 199-258 six cylinder and AMC built four cylinder engines, and on the valve cover tag on V8 engines. MID 1967 AND LATER: A different letter represents each part and the modification. The letter is located on the boss directly above the oil filter on six cylinder engines, on the valve cover tag on V8 engines. One or more letters may be present: B- 0.010 oversize cylinder bore C- 0.010 oversize camshaft bearing bore M- 0.010 undersize connecting main bearings P- 0.010 undersize connecting connecting rod bearings ENGINE DAY BUILD CODE AMC used a the Engine Day Build Code as a serial number for all engines starting in 1960. This code gives the date the engine left the assembly plant fully running and has a code for the engine sizetype. NOTE: This code is NOT necessarily the same as found on the VIN. In some cases it is, but often the VIN code changed whereas the build code remained for any size engine. An important thing to remember about AMC engines is that changes were made on a calendar year basis, not model year. The engine plant ran on its own schedule This is why some 1980 model vehicles have the heavy 258 and others the light 258 -- changes were made early in calendar year 1980. Day built Thus, 409C21 indicates 1962, September, 195.6 OHV (cast iron), 21st day. For those that do (such as 3 -- 1961, 1970, 1979, 1983, 1993) casting numbers may have to be consulted if the engine date is important, such as for a restoration. Day Built Year Codes 11959 2-1960 31961 41962 51963 61964 71965 81966 91967 11968 21969 31970 41971 51972 61973 71974 81975 91976 11977 21978 31979 Beginning in 1980 the last digit of the year is used (19800, 1981 1, etc.) Engine SizeType Codes 1960-1967: AMC complicated things these years by using a different code in the VIN of each model for the same engine in at least 66 and 67. This confuses many sources The codes below are used in the Engine Day Build Code, which is the same for all models. Serial number codes will be found with serial number decoding information. VIN and engine code numbers are different This can be confusing. The 4.0 has an engine code of MX, but there are three different VIN codes (M, L, S). The earliest VIN code usually matches the engine code, later versions of the same engine may have different VIN codes but engine code usually remains the same. An AMC Annual is published yearly listing all known AMC and related makes clubs. There may be one in your area The AMC Annual may be purchased without subscribing.
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