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Thread: reusing arp head hardware

  1. #1
    Join Date
    Jan 2019
    Location
    houston
    Posts
    183
    My Cars
    2017 F150, 97 M3

    reusing arp head hardware

    Is there any advantage to purchasing new arp head hardware vs reusing a used set? I don't want to cut corners but I also don't want to throw away money for nothing.

  2. #2
    Join Date
    Jun 2005
    Location
    New England
    Posts
    25,402
    My Cars
    F90 M5; E36 M3 Turbo
    I had one set of studs that I reused 4 times over several years. Motor was turbo. The studs were never a problem. You can measure for stretch if you yo be certain. I never measured and those studs were torqued to the original ARP spec with the two 90s that tested at about 120 lbs. ARP later changed to straight 85, and I think may now be 75.

  3. #3
    Join Date
    Feb 2017
    Location
    Raleigh, NC
    Posts
    288
    My Cars
    1998 M3 643whp
    What boost ya running? High boost is where this can become an issue. 20psi, is probably no problem. If you are up around 35+psi, then I would not test it. The good thing is that they don't fail catastrophically and will just blow the HG which you should be able to catch before it becomes an issue.

  4. #4
    Join Date
    Jul 2009
    Location
    Bellingham, WA
    Posts
    364
    My Cars
    1998 M3, 2001 530i
    clean the used ones off really well and check for white wear marks on the threads and any necking down or other deformation. Undamaged used and properly relubricated studs will work the same as new ones.

    Sent from my LM-V350 using Tapatalk

  5. #5
    Join Date
    Jan 2019
    Location
    houston
    Posts
    183
    My Cars
    2017 F150, 97 M3
    thanks these were off a turbo motor running 18 psi

  6. #6
    Join Date
    Jun 2012
    Location
    Socal
    Posts
    298
    My Cars
    turbo e36
    Ive reused my arp studs on 3 motors? No issue with gasket sealing yet, have thrown rods, melted pistons, fun stuff.

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