With the increase in value of many "numbers matching" collectorĬars, some folks have "restamped" the blocks to deceive buyers. Some blocks have been "restamped" in order to "create" a "numbers matching" Normally found on the passenger side front deck of the block, may have been removedīy the machining process. Previously "decked" by a machine shop, the engine assembly date and suffix codes, There are two other things to keep in mind. The motors built in the McKinnon factory in Canada will have a "K" indicating the engine assembly plant. On the block, such as "ZZ3" or three letter codes such as "XXA". GM Performance Parts, may have different prefix code identifiers stamped in to the front pad Later model crate engines, sold over the counter by Chevrolet or Many of the new GM crate motorsĪre being made in Mexico. Or heads of "Hecho en Mexico" which means "Made in Mexico". You may also see a raised casting on the block Stamped into the front pad of the block followed by a series of numbers which serialize Likewise if a purchaser bought a new motor from the Chevrolet Parts counter, theįront pad on the pasenger side of the block may have been stamped with a "CE" code.Ī number of crate motors made by GM in Mexico, may have an "M" or "ML" prefix It was under warranty, it was replaced with an engine that was stamped "CE" withĪ number of numeral digits following it which serialized that particular engine. If a customer had problems with his original motor, while The "CE" prefix was also used on "over the counter"īlocks and engines. Stand for "Chevrolet Engine" or "Crate Engine" was used on blocks that were The "CE" which alternatively has been known to You might see something like this "CE123456" on the front pad of the block deck on There is another type of stamping found on some blocks. If you need help decoding the suffix codes, just email us. You need to look at ALL of the casting identifiers before making your determination.ĭeciphering VIN numbers, trim tags and original factory documentation can also help. Relying solely on the suffix code to identify the original use of the block can be misleading. You would need to look at the block castingĭate to know which year the block was made to narrow down the possibilities. "CMR" was again used in '78 with a Corvette and aĭifferent engine/transmission combination. Some of the Engine Suffix letter code combinations were used a number of times.įor example, in 1974 the suffix code "CMR" was used on three different vehicle models with the same engineĪnd transmission combinations. Sometimes the stamping is found above the timing cover mating surface on the front of the block. was stamped into aĭifferent area of the block on the flange edge of the rear of the block, near the bellhousing mating Into the pad on the front passenger side of the block. In that case you might see "T0422TR 1123456789" stamped In later years, parts of the Vehicle Identification Number (V.I.N.) were also added before or after Of the alphabet to code the type of engine, transmission and vehicle into "suffix code" which in this example is "TR". ![]() Don't mistake this for a capital letter "I". In the 50's and 60's, Chevy used a Roman numeral " I " for the number " 1 " in these engineĪssembly dates. The motor was assembled at the Tonawanda factory on April 22nd. So what do we have so far in this example? The "22" standsįor the 22nd day of the month. The year, in this example "04" or the fourth month April. The next two digits stand for the month of In thisĬase the first letter "T" stands for an engine factory Tonawanda. On later model engines the engine assembly code looks similar to this "T0422TR". Which only included the last two digits of the year. Some very early smallblocks from the mid 1950 model years had an Engine Assembly Date Of the block above the timing cover mating surface on the front of the Some blocks have the engine assembly code on a flat portion You may have to move the alternator to be able to read this engineĪssembly code. Is on the passenger side of the motor, the ledge on the block deck is rightīelow it. ![]() On the passenger side of the block deck at the front. These date codes are can beįound in a number of locations on the block, but most often are found onĪ ledge that is visible when the motor is assembled. The metal as opposed to a "raised" casting. The engine assembly date is a "stamped in" code that is stamped into ![]() Join our Forums! Chevy V8 Casting Number Locations (Part 2) Engine Assembly Date / Suffix Code
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