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Thread: Valve cover engine numbers

  1. #1
    Thank you from BT Junior wrench of the Forum
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    Valve cover engine numbers

    I know this subject has been covered before, but my searches are not bringing up any info. I'm selling an old 360 with the the valve cover numbers of 611H16 and someone wants to know the year of the motor. The heads castings come up as a 74. I've tried using the search feature but I'm not having no luck. Can someone direct mr to the thread with the valve cover thread info?
    74 CJ5, 360w/T-18/D20, Scout D44's Locked front & rear w 5.38's, 36" Swampers & a ton of work...

    It's a Jeep thing, Chrysler doesn't understand!

  2. #2
    Thank you from BT ULTIMUS MAXIMUS STATUS tufcj's Avatar
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    The tag will break down as follows:
    1st Digit is the YEAR
    2nd & 3rd Digit is the MONTH
    4th Digit matches 7th Digit of the VIN (engine size)*
    5th & 6th Digits match DAY OF MONTH engine built
    =================
    FIRST DIGIT is YEAR
    1=1968; 2=1969; 3=1970; 4=1971; 5=1972; 6=1973; 7=1974
    Other early years:
    1=1959; 2=1960; 3=1961; 4=1962; 5=1963; 6=1964; 7=1965; 8=1966; 9=1967
    Other later years:
    8=1975; 9=1976; 1=1977; 2=1978; 3=1979; 0=1980
    Final end run years:
    1=1981 VIN Code B; 2=1982 VIN Code C; 3=1983 VIN Code D; 4=1984 VIN Code E
    5=1985 VIN Code F; 6=1986 VIN Code G; 7=1987 VIN Code H; 8=1988 VIN Code J


    It looks like the valve cover was changed at some point. 611H16 would decode as follows:

    6 = 1973
    11 = November
    H = 2BBL 304 (1970-1979)
    16 = day of month
    So your valve cover came from a 2BBL 304 manufactured November 16, 1973.

    Info from here: http://www.planethoustonamx.com/ Go to the "production/tech" tab on the left.

    Bob
    tufcj
    1969 AMX
    1967 Rambler Rogue

    If you need a tool and don't buy it...
    you'll eventually pay for it...
    and not have it.
    Henry Ford

  3. #3
    Thank you from BT Junior wrench of the Forum
    Join Date
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    Location
    North Plains, Orygun
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    Thanks a bunch Bob!
    74 CJ5, 360w/T-18/D20, Scout D44's Locked front & rear w 5.38's, 36" Swampers & a ton of work...

    It's a Jeep thing, Chrysler doesn't understand!

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