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Thread: 4D55/6 ARP Head stud part numbers

  1. #1

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    4D55/6 ARP Head stud part numbers

    I've never seen this published anywhere so here's for anyone wanting to get rid of the torque to yield bolts.

    ARP STUDS part # AU4.950-2UB

    ARP NUTS part # 300.8308

    ARP WASHERS part # 200.8500

    You will need 17 of each

    Jeff

  2. #2

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    Correction 18 of each

  3. #3

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    Might be a good idea to add this to the parts sticky

  4. #4

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    Bumping/adding to this. I had been contacting ARP through email, they do not have anything documented for the 4d55/56, however from measurements, here are the numbers he gave me

    Stud
    Au4.600-2b m12x1.25 to m12x1.75 by 117mm
    $16.92 each

    Nut
    300-8376 m12x1.75
    $5.38 each

    Washer
    200-8500
    $1.19 each


    REVISED, As of current, the tech changed his mind after i asked about clamping force with the 1.75 threading, to which he replied that he agrees that he would not trust the 1.75 up top.
    Last edited by skullzaflare; 05-31-2018 at 09:20 AM.

  5. #5




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    That makes no sense - they are ARP studs, way stronger than any factory stud / bolt, and they don't trust it? Then why are they selling it?
    Pennyman1
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    Living the D-50 lifestyle since 1980

  6. #6

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    Quote Originally Posted by pennyman1 View Post
    That makes no sense - they are ARP studs, way stronger than any factory stud / bolt, and they don't trust it? Then why are they selling it?
    You know how there are 'experts' who 'know' what they're doing? I would think that ARP's tensile strength testing of 170,000 psi would be up for it (304 stainless - the UTS version of the same studs are rated 270,000 psi) The, err, 'best' chinese equivalent would be down at least 30% of those figures...

    http://arp-bolts.com/p/technical.php
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  7. #7

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    I bought a set from them, the guy I spoke to said that that part number was made from there 200,000 PSI tensile strength ARP2000 steel. He asked what I was using it for and said they ought to hold up great. I've been running them now for about 6 months with no problem, just wondering how my factory turbo is holding so much boost...

  8. #8

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    Quote Originally Posted by dancinggecko View Post
    ...just wondering how my factory turbo is holding so much boost...
    You know that Mitsubishi turbos get sourced as replacements for use on other vehicles? The Porsche guys rip the KKK turbos off their engines and use factory Evo ones, too funny
    (don't know if it's because the Mitsu turbos are geniunely superior or they feel bad about getting their asses handed to them by guys in Evos and will try anything )
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  9. #9

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    Quote Originally Posted by pennyman1 View Post
    That makes no sense - they are ARP studs, way stronger than any factory stud / bolt, and they don't trust it? Then why are they selling it?
    The thought is, those studs i listed are being flipped over and used the wrong way.
    12x1.75 into the block would be using all the threads, but flipped it will only have a 3/4" nut on it. Far less surface area to grab than a 12x1.25
    Quote Originally Posted by geezer101 View Post
    You know that Mitsubishi turbos get sourced as replacements for use on other vehicles? The Porsche guys rip the KKK turbos off their engines and use factory Evo ones, too funny
    (don't know if it's because the Mitsu turbos are geniunely superior or they feel bad about getting their asses handed to them by guys in Evos and will try anything )
    They do last a lot longer than most turbos, side note the stock turbo didnt even last a week at 30psi, but thats because i dropped throttle to fast in a quick panic and bent all the blades

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