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Thread: V8 ARP Stud Torque Numbers

  1. 28th January 2013, 05:49 PM #1
    Davo
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    V8 ARP Stud Torque Numbers

    I've been doing my homework again and thought I'd post my list of what torque settings, (in ft lbs), different people have used.

    Head studs:
    - ARP Instructions: 80 + ARP lube
    - Real Steel: 65 + ARP lube
    - V8 Developments: 75
    - TR Spares: 65
    - PhilipA on this forum: three stages - 40-60-80
    - AULRO member quoting UK builder: 65-70
    - UK V8 forum: 65-70

    Mains:
    - ARP Instructions: 110 + ARP lube
    - Real Steel: 90 + ARP lube
    - AULRO member quoting UK builder: 65
    - RPi: 90
    - Des Hammill: 70-75 okay, 90 too much unless line boring
    - UK V8 forum: 80

    This should help anyone else who thought the ARP instructions sounded like too much! I'll probably go with 70 on the heads and 75 for the mains.

    A really important point is to tighten up in stages, and that the ARP lube has been proven as far more reliable for consistent torque than anything else. It seems to require lower torque as well, probably because it's so slippery.

    There is also some talk about backing off and re-torquing. This seems to depend on what your preference is, but it sounds like it's not a bad idea, at least where a head gasket is being squished.
    At any given point in time, somewhere in the world someone is working on a Land-Rover.
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  2. 28th January 2013, 06:19 PM #2
    Pedro_The_Swift's Avatar
    Pedro_The_Swift
    Pedro_The_Swift is offline The MOD Father
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    Handwritten note from TRS,,

    mind you this gasket only lasted 2 years.
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!

    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]
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  3. 28th January 2013, 06:26 PM #3
    Hoges
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    I got a set of the ARP studs which they developed specifically for the 4.0/4.6 10-bolt head. They recommended 90 ft lbs
    Thanks to advice from this forum I used 65ft lbs (3 stages) with the composite gasket (Elgin). So far so good. A couple experienced aviation engineers thought 90 was way too much and supported 60-70 (max) especially with the Elgin composite gasket which appears to be quite reliable.

    Was interesting that when I removed the heads, they were fitted with the original metal gasket! (Thor 4.6 July 1999 build)
    MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
    2020 Subaru Impreza S ('SWMBO's Express' )
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  4. 28th January 2013, 06:37 PM #4
    Davo
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    Yes, with lots of reading you can see that there have been a few cases of block threads failing with the higher numbers, like 80 or 90.

    Pedro, that was your photo I used for reference but I couldn't be bothered re-reading everything again to find it!
    At any given point in time, somewhere in the world someone is working on a Land-Rover.
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  5. 28th January 2013, 06:48 PM #5
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    MacMan
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    On my 3.9 rebuild I ran Payen tin gaskets (coated with Hylomar spray) on 14 bolt heads, 10 main bolts in standard order in 3 cycles of 25/50/75 ft/lb. Outer bolts done to 10 ft/lb only. All good 6 months/14,000km later.
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  6. 29th January 2013, 11:53 AM #6
    Davo
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    Hey MacMan, I remember replying to your V8 problems thread last year, but just discovered your engine build thread yesterday with the lovely photos. Good to see it's been running well, at last.
    At any given point in time, somewhere in the world someone is working on a Land-Rover.
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  7. 29th January 2013, 04:06 PM #7
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    MacMan
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    Thanks Davo.

    I have enough "distance" from the horrors of it all that I smile every time I drive it now. I'm even careful about which shoes I wear since some feel like all ankles when I go to heel-and-toe it.
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