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Thread: Does anybody know what these bolts are for?

  1. 7th March 2021, 05:49 PM #1
    grh
    grh is offline Fossicker
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    Does anybody know what these bolts are for?

    G’day Folks,

    Came across these while trying to start a 1983 RRC which had been sitting for a couple of years (interesting outcome, perhaps in another story).

    These bolts are adjacent to each exhaust port and don’t appear to be in the right place or orientation to be useful, they are not head bolts.

    The engine is a 14D so from an Australian build as I understand it.

    When I saw these bolts my mind turned to EGT sensor ports perhaps.

    Interested in any suggestions.

    Graeme
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  2. 7th March 2021, 05:56 PM #2
    Graeme
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    Air inlet ports to the exhaust system. I used longer bolts in mine when I removed the rusted-out pipes.
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi, RTK base station using LoRa
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  3. 7th March 2021, 06:03 PM #3
    grh
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    Aha, that makes sense, I did read about some exhaust air injection for emission control.

    Might be a great place to fit and EGT sensor .

    I wonder why I don’t see these bolt heads on photos of other heads, I had a good hunt around on the internet
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  4. 8th March 2021, 05:12 PM #4
    PhilipA
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    AFAIR the heads were only fitted to cars prior to unleaded in OZ and were only for air injection cars from about 81 to 84. They had an emission cam also which destroyed performance

    Nearly all have all the stuff removed.

    regards PhilipA
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  5. 9th March 2021, 05:58 AM #5
    Graeme
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    Quote Originally Posted by PhilipA View Post
    They had an emission cam also which destroyed performance
    Maybe that's why my 9/84 was lack-lustre compared with my earlier one.
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi, RTK base station using LoRa
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  6. 9th March 2021, 07:00 AM #6
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    Homestar
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    Quote Originally Posted by PhilipA View Post
    AFAIR the heads were only fitted to cars prior to unleaded in OZ and were only for air injection cars from about 81 to 84. They had an emission cam also which destroyed performance

    Nearly all have all the stuff removed.

    regards PhilipA
    My early 86 model head these heads and later in the year they went to the flapper style EFI so getting bits for an 86 is always a crap shoot as they changed heaps on them mid year.

    I only ditched mine when I stuck the 3.9 14CUX in from a disco 1. Engine had other issues besides lack of power by then with 365,000 KM on it.
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.
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  7. 9th March 2021, 04:12 PM #7
    grh
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    So are there any issues running this engine on ULP? It had LPG so I suspect there is no problem. I have partially got rid of it. All the gas stuff made the engine bay look ugly, besides it got in my way when trying to find why the engine wouldn't start.
    getting rid of the gas tank will be good too.
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  8. 15th March 2021, 04:43 AM #8
    Meccles
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    No issue running unleaded they are aluminium heads with valve seat inserts so good to go
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