2.25 rocker arm

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  • MerlynIIa
    Low Range
    • Sep 2007
    • 54

    2.25 rocker arm

    Will the rocker arm assembly from a 7.1 head (from a 1965 IIa) work on a 1974 8.1 head? I have a complete IIa engine and a Series III engine without the rocker arm and valve cover. I would like to rebuild the series III 8.1 head with the hardened valves and then use the rocker arm and valve cover from the IIa head. I had noticed some rocker arm parts on the IIa assembly are IIa specific in the Rovers North catalog, so worried they had some differences. Thanks!
    '65 Series IIa (not running)
    "73 Series III (not running)
    (combining the two to make one.)
    '00 Disco II
  • I Leak Oil
    Overdrive
    • Nov 2006
    • 1796

    #2
    I think in most cases the entire thing will just bolt on. The only possible issue I could see is if you had a really late III head then you might run in to an issue with the metric-SAE fasteners. I'm not 100% positive about that though. As long as you use the entire IIa assembly I think you'll be fine. Easy enough to find out by removing the 6 or so bolts and letting it rip!
    Jason
    "Clubs are for Chumps" Club president

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    • allende
      Low Range
      • Apr 2007
      • 21

      #3
      Check pushrod lengths, they are different lengths for 7:1 and 8:1 heads as the 8:1 head is about 0.10 in less in thickness. The later heads are metric. One issue I encountered was not having a metric threaded banjo bolt for the oil return pipe. Had to craft one using a metric bolt and drill press. Also look at the rocker shaft and see if it's worn. If so you may need a new one. If you get a new one, the rocker arms will have to be honed to fit. Take a look at: http://www.lrfaq.org/Series/Engine.CylinderHead.html

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      • MerlynIIa
        Low Range
        • Sep 2007
        • 54

        #4
        Appreciate the information, will check things out further before we get to work on it. again, thanks
        '65 Series IIa (not running)
        "73 Series III (not running)
        (combining the two to make one.)
        '00 Disco II

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