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Thread: Engine Suffix Code Helpful Info

  1. #1
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    Default Engine Suffix Code Helpful Info

    The Engine Suffix Code is stamped on a block pad located immediately forward of the right hand or passenger side cylinder head picture here. The entire engine code contains the assembly plant, month (MM) and day (DD). See note below if your month or day code has a letter "I" instead of a number in it.

    Engine Code Style Pre '70: F0114MB F 01 14 MB
    Assembly Plant
    Assembly Month (MM) Assembly Day (DD) Suffix


    Engine Code Style '70 on: F0114CMB F 01 14 C MB
    Assembly Plant
    Assembly Month (MM) Assembly Day (DD) Motor Division
    Suffix


    Note: Some don't have a motor division for example. F 01 14 UAF
    Assembly Plant
    Assembly Month (MM) Assembly Day (DD) Suffix


    Note about the letter "I" instead of a number "1" in the engine code for the date: Sometimes the number "1" looks like the letter "I" for the date codes. It is still a date code. All date codes are two digits, always, so if it looks like the letter "I" it is still the number "1". For example the actual stamped code may be "F0II4MB" but it really is "F0114MB".

    Engine Assembly Plant Codes: Motor Division:
    F - Flint Motor Plant C - Chevrolet passenger car
    K - McKinnon T - Chevrolet truck
    M - GM of Mexico
    S - Signaw Service
    T - Tonawanda Engine Plant
    V - Flint Engine Plant

    Close to the engine suffix code is the partial VIN code. Partial VIN example:
    "18U199887" decodes as "1"=Chevy, "8"=1968, "U"=Vehicle assembly plant Lordstown, Ohio and "199887"=last six digits of VIN.

    VIN Assembly Plant Codes: (Continued)
    A - Atlanta, Georgia R - Arlington, Texas
    B - Baltimore, Maryland S - St. Louis, Missouri
    C - Southgate, California T - Tarrytown, New York
    C - Atlanta, Georgia (Doraville) ('64 only) U - Lordstown, Ohio
    D - Atlanta, Georgia (Doraville) U - Southgate, California ('64)
    F - Flint, Michigan W - Willow Run, Michigan
    G - Framingham, Massachusetts Y - Wilmington, Delaware
    H - Fremont, California ('64 only) Z - Fremont, California
    J - Janesville, Wisconsin 0 - Oshawa, Canada ('65-'69)
    K - Kansas City, Missouri 1 - Oshawa, Canada ('70-)
    L - Los Angeles, California 1 - St. Therese, Canada ('67-'69)
    N - Norwood, Ohio 2 - St. Therese, Canada ('70-)
    O - Oakland, California

    Some of the Engine Suffix codes were used a number of times. For example suffix code "CMJ" was used in 1974 on a 350 and in 1980 on a 305. You need to look at the block casting date and casting number to narrow it down. Do not just rely on the suffix code to identify the original use of the block because it can be misleading in some cases. You should always look at ALL of the casting identifiers to determine exactly what engine you have.

    "CE" or Crate engine information: CE123456

    CE 123456
    Crate Engine
    Serial Number

    Another type of stamping found on some blocks 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 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 their original engine, while it was under warranty, it would have been replaced with an engine that was stamped "CE" with a number following it. The number following the "CE" code was the serial number for that particular engine. Also if someone purchased a new motor from the Chevrolet Parts counter, the front pad on the passenger 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 is the serial number of 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".
    Thanks Steve


    'Stop telling God how big your storm is.
    Instead, tell the storm how big your God is!'

  2. Thumbs up

    great info, thanks steve!

  3. #3

    Exclamation

    Im building a chevy 350 i planned on using a fly wheel off of a 305 but found that it didnt fit and i was going to use an intake manifold of of a different motor and it wouldnt work either. I cant seem to figure out what this motor really is please help.

    casting code on rear of motor- 10243880

    stamping code front of motor- VK047270

    fixed tag on front drivers side of block- CLV-1 69095

    casting number inside of heads- 14102191

  4. Default

    Not sure but but there was a change in the engines some where in the early 90's the intakes bolts arangement and or angle of bolts was changed same with heads don't recall just what all was changed but rear main seal was changed also early has 2 pc. seal later has 1 pc seal
    Enjoying what I get to do everyday PLAYING IN MY SHOP
    www.fishertrains94.webs.com
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  5. #5

    Default

    oh okay thanks!
    u wouldnt be able to tell me anythin about the motor from the numbers i posted though would u?

  6. #6

    Default

    Quote Originally Posted by brndncpr View Post
    Im building a chevy 350 i planned on using a fly wheel off of a 305 but found that it didnt fit and i was going to use an intake manifold of of a different motor and it wouldnt work either. I cant seem to figure out what this motor really is please help.

    casting code on rear of motor- 10243880

    stamping code front of motor- VK047270

    fixed tag on front drivers side of block- CLV-1 69095

    casting number inside of heads- 14102191
    10243880 350 96-up 2 & 4-Bolt Vortec Roller

    14102191 305/350 87-up 1.84/1.50

  7. #7
    Join Date
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    Location
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    Posts
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    Default suffix code

    Hello, My name is Gary. I have a 350 I am trying to identify. the casting # is 14010207 which tells me it is a 1980 to 1984 motor. However the code on the passenger side in front of the head is V0618ACM. from what I have read this is a Flint motor with month of June and 18 day. OK, but I can not find anything on the ACM. that does not match suffix codes I have found listed. I have check and double checked to make sure it says ACM and it is very clear it does. on the edge in the same area next to the engine code is stamping 040. Can anyone tell me what the ACM stands for?
    Gary

  8. Default

    Just a guess .040 maybe a rebuilt engine 040 over????? ACM maybe the company that did the work?? don't realy know just a guess. Do a search on Yahoo.com for ACM engines they build race engines. Where are you located??
    Last edited by cffisher; 04-12-2011 at 08:18 AM.
    Enjoying what I get to do everyday PLAYING IN MY SHOP
    www.fishertrains94.webs.com
    Every one needs a hobby I have 3
    W8AMR
    Laus Deo

  9. #9
    Join Date
    Apr 2011
    Location
    Southern Mississippi
    Posts
    5

    Default engine

    Quote Originally Posted by cffisher View Post
    Just a guess .040 maybe a rebuilt engine 040 over????? ACM maybe the company that did the work?? don't realy know just a guess. Do a search on Yahoo.com for ACM engines they build race engines. Where are you located??
    I am located in south Mississippi. I picked the engine up from a guy in St. Louis that had it in a Toyota FJ40 Landcruiser. not sure where it came from, which is why I was trying to identify the motor for parts, etc. any help would be appreciated.
    Gary

  10. #10
    Join Date
    Apr 2011
    Location
    Southern Mississippi
    Posts
    5

    Default

    any other suggestions on the suffix code ACM?
    Gary

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