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Engine Number V6 225

Discussion in 'Early CJ5 and CJ6 Tech' started by perreaultjy, Feb 1, 2021.

  1. Feb 1, 2021
    perreaultjy

    perreaultjy New Member

    Quebec Canada
    Joined:
    Dec 12, 2008
    Messages:
    10
    While searching for the engine number on my V6 225 (with engine casting number1375162) the only thing I did find was stamped between cylinder 2 and 4 511 KMH.

    Is this the engine number ?

    If not where the heck is the engine number hiding ?

    What is the meaning of 511 and KMH ?
     
  2. Feb 4, 2021
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
    Messages:
    5,208
    So normally the 'casting number' is what I've heard referred to as the 'engine number'. The other stamps... I'm not seeing what you have. I'll paste what I've used in the past on my motors.

    225 v-6 engine id codes: Buick special 64-67 (1 and 2 bbl.)
    • 1964 = KH [between branches of right exhaust manifold]
    • 1965 = LH [engine number on the right front face of the crankcase, just below cylinder head]
    • 1966 = MH [as '65 above]
    • 1967 = NH [as '65 above]
    ...so the codes are either on the side or front of the block just under the cylinder head.

    (I have heard rumors of a few engines produced in '63).

    All are listed as 9.0-1 comp. ratio.

    The engine codes seem to indicate that the first letter is the engine year, while the second letter is the comp ratio (9.0-1). The two letters together identify this engine as a 225 V-6, as the same year letter was used by Buick for all engine types '64-'71 (v-6, v-8) but the second comp ratio code letter varied between different engine types with the same comp ratio (i.e., a '64 V-6 comp ratio 9.0-1 is a "KH", while a '64 300 V-8 comp ratio 9.0-1 is a "KL").

    From "Service Manual Jeep Universal Series";
    "The engine code number shown in Fig A-4 is provided to identify the Dauntless V6-225 engine. The meaning of the coded letters and numbers that are stamped on the right front face of the crankcase, just below the rocker arm cover, between exhaust manifold ports, is given below:

    Letter to designate market:

    • M-Military
    • E-Export
    • D-Domestic
    Letter to designate year Built:

    • N-1967
    • P-1968
    • R-1969
    • S-1970
    • T-1971
    Letter to designate Engine Compression Ratio:

    • H-V6-225 9.0 to 1 C.R. (2bbl carb)
    • Y-V6-225 9.0 to 1 Marine (Low Profile) (2 bbl carb)
    • Z-V6-225 9.0 to1 Marine (High Profile) 2bbl carb
    • K V6-225 7.6 to 1 (2bbl carb)
    • L V6-225 7.4 to 1 (2bbl carb)
    The next three numbers are then the day of the year noted in the second position.
     
    Beach66Bum and 47v6 like this.
  3. Feb 5, 2021
    perreaultjy

    perreaultjy New Member

    Quebec Canada
    Joined:
    Dec 12, 2008
    Messages:
    10
    Thank you. What is the meaning of 511 just above the KMH ?
     
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