Swam Engine Code Tech Tools

Whats New Decode Tech Tools FAQ Dales BooksCDs Contact Macs Registries for ChevelleCamaroNovaHHR Chevelle of the Month Things For Sale Zone Dealer Numbers Trim Tag Decode Date Stamp Characters V8 Engine Block Casting Month Codes A - January B - February C - March D - April E - May F - June G - July H - August I - September J - October K - November L - December Date codes consists of a letter, 1 or 2 digits for the day, and 1 digit for the year such as J 25 7 would be October 25, 1967.

The block casting number on small block and big block Chevy V8 motors is located on a ledge found at the rear of the block, most often on the drivers side.

This ledge is below the deck of the block and the ledge forms the mating surface between the block and the transmission bellhousing.

Engine Assembly DateSuffix Code: The engine assembly code looks similar to this: T0601ED.

In this case the first letter T stands for an engine factory Tonawanda Engine Plant, either F or V would indicate Flint, MI., K is used for McKinnon Industries while S is used for Saginaw Service.

Sometimes (but not always) the letter I is substituted for the number 1.

So what do we have so far in this example The motor was assembled at the Tonawanda factory on June 1st.

What we have left is the suffix code which in this example is ED, a 1966 396cid325hp for a manual transmission.

Chevy used one to three letters of the alphabet to code the type of engine, transmission and vehicle into the suffix code.

In that case you might see T0601ED 6A174373 stamped into the pad on the front passenger side of the block.

In this example, 6A174373 decodes to 1966 Atlanta final assembly, and the last six digits of the VIN.

Depending on the year and plant, the partial VIN could be stamped into a different area of the block; the flange edge of the rear of the block near the bellhousing mating surface, the rough cast area next to the oil filter and sometimes the stamping is found above the timing cover mating surface on the front of the block.

Beginning January 1, 1968 the federal government requested voluntary compliance of identifying major parts of a motor vehicle by inscribing or affixing an identifying number or symbol on major parts.

Again, the location on the block may vary between the plants and years but one change was made in 1968.

A 1968 version of an Atlanta partial VIN stamping would 18A174373.

Beginning in late 1969 model year, 3-letter engine suffix codes were used on the engine pad.

This example happens to be a September 22-built 1970 396 engine with a TH400 transmission as noted by the CTW suffix code.

The plant, date, and engine ID codes were stamped at the respective engine assembly plants while the partial VINs (when applicable) were stamped at the final assembly plant.

Therefore the two stampings will have different fonts, character sizes, and in some cases will be stamped at different locations on the engine block.

You might see something like this CE056789 on the front pad of the block deck on the passenger side.

If a customer had problems with his original engine, while it was under warranty, it was replaced with an engine that was stamped CE with a 6-digit number following it which serialized that particular engine.

Its important to note that the CE designation for replacement Chevrolet engines did not start until 1968 so any year designation in the engine number would be for 1968 and later.

The CE block stamp year is the year the block was stamped and not for what year of car the block was destined for since a generic block for fitted engine could be used as a warranty replacement for any number of years engines, applications, and for cars produced from any assembly plant.

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