Chevy V8 Casting Number Locations (Part 2)
Some of the Engine Suffix letter code combinations were used a number of times. For example, in 1974 the suffix code "CMR" was used on three different vehicle models with the same engine and transmission combinations. "CMR" was again used in '78 with a Corvette and a different engine/transmission combination. You would need to look at the block casting date to know which year the block was made to narrow down the possibilities. Relying solely on the suffix code to identify the original use of the block can be misleading. You need to look at ALL of the casting identifiers before making your determination. Deciphering VIN numbers, trim tags and original factory documentation can also help. If you need help decoding the suffix codes, just email us.
There is another type of stamping found on some blocks. This is the "CE" code. You might see something like this "CE123456" on the front pad of the block deck on the passenger side. The "CE" which alternatively has been known to stand for "Chevrolet Engine" or "Crate Engine" was used on blocks that were warranty replacement motors. The "CE" prefix was also used on "over the counter" blocks and engines. If a customer had problems with his original motor, while it was under warranty, it was replaced with an engine that was stamped "CE" with a number of numeral digits following it which serialized that particular engine. Likewise if a purchaser bought a new motor from the Chevrolet Parts counter, the front pad on the pasenger side of the block may have been stamped with a "CE" code.
A number of crate motors made by GM in Mexico, may have an "M" or "ML" prefix stamped into the front pad of the block followed by a series of numbers which serialize that particular crate replacement motor. You may also see a raised casting on the block or heads of "Hecho en Mexico" which means "Made in Mexico". Many of the new GM crate motors are being made in Mexico. Later model crate engines, sold over the counter by Chevrolet or GM Performance Parts, may have different prefix code identifiers stamped in to the front pad on the block, such as "ZZ3" or three letter codes such as "XXA".
The motors built in the McKinnon factory in Canada will have a "K" indicating the engine assembly plant.
There are two other things to keep in mind. If the block has been previously "decked" by a machine shop, the engine assembly date and suffix codes, normally found on the passenger side front deck of the block, may have been removed by the machining process. They will be gone. Second, some blocks have been "restamped" in order to "create" a "numbers matching" vehicle. With the increase in value of many "numbers matching" collector cars, some folks have "restamped" the blocks to deceive buyers. BE CAREFUL! Check out some of the books listed below. They can help you determine if the vehicle is a "numbers matching" original car or not.
Chevy V8 Head Casting Number Locations
Chevy smallblock and big block cylinder heads have the CASTING NUMBER and the CASTING DATE located in the rocker arm valley. These numbers are found after removing the valve cover on the head. Some cast iron heads have the casting number on the underside of an intake runner. Some aluminum heads have the casting date on the underside of an intake runner. The casting number of the cylinder head follows the same form as those found on blocks. There will be six to eight digits for the casting number. The head casting date will have a letter for the month and numerals for the day of the month
and the year of the decade. Some head casting dates will give the decade and year. In the picture above, the casting number is shown with the casting date right below it. On other head castings the casting date may be in a different location in the rocker arm valley and is not always right below the casting number. Look at all of the features on the heads to help determine which casting you have and when it was made.
Other Block Markings
There are other things found when you stare at these parts and casting identifiers for a while. On big blocks, you may see the words "HIPERF", "HIPER", "TRUCK", "M.TRUCK", "PASS", "MAR" or "MARINE" cast into the block. You may see one or a combination of some of these words. First let me say that "HIPERF" or "HIPER" was used on ALL '65-'91 Mark IV big block blocks and is not an indication that it has four bolt main caps and was used in a high performance application. Two-bolt, low performance big blocks received the same "HIPERF" designation. (In this regard, keep in mind that ALL '91 and later Gen.V and Gen.VI big blocks come with 4-bolt main caps. The two-bolt big blocks are no longer in production.) These same words can be found on the head castings also. Usually the "HIPERF" casting on a head indicates a rectangular port head, but I have found one large oval port head with "HIPERF" showing in the rocker arm valley. This was head casting number 14092359 and was off of an '87 tall deck 427 truck motor.\
"CONV" is just a foundry mark and is NOT an indicator that the motor was originally installed in a convertible.
"CFD" is an abbreviation for the CENTRAL FOUNDRY DIVISION.
Often you will find the last three digits of the block casting number cast in various places around on the cylinder block.
Some of the Gen.1 smallblock motors used blocks with an additional 1% tin and an additional 2% nickel added to the cast iron alloy. These desirable blocks can be identified by looking at the block face under the timing chain cover for "010" AND "020". These designators can also sometimes be found on the rear face of the block inside the perimeter
of the bellhousing mating surface.
Casting Number Books and Publications
There are some great books out there that can help you determine which parts were used in particular years with a particular vehicle. If you are interested in a "numbers matching" vehicle and are concerned with the "originality" or the original factory installed use of a particular engine and parts check out the following:
Other books concern themselves with parts "interchanges". These are slightly different than those listed above. These parts "interchange" reference texts relate which parts are similar or have similar features which will interchange with other parts even though they may have different casting numbers or part numbers. A part made in one model year for a vehicle MAY interchange with a part made for a different vehicle made in another model year. Some of the better ones are listed below:
All of the above listed reference books and hundreds of others about Chevrolet are available from Amazon.
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