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Head Bolts?

Discussion in 'Intermediate CJ-5/6/7/8' started by HarvestGold, Jan 11, 2022.

  1. Jan 11, 2022
    HarvestGold

    HarvestGold New Member

    Nebraska
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    Nov 13, 2020
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    38
    I'm having a tough time finding new head bolts for the AMC 4.2L in my '74 CJ‐5. Does anyone know where I can order some? I would like to reassemble and paint the engine soon
     
  2. Jan 11, 2022
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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  3. Jan 11, 2022
    HarvestGold

    HarvestGold New Member

    Nebraska
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    Nov 13, 2020
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    38
  4. Jan 11, 2022
    Dale Park

    Dale Park Member

    Utah
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    Feb 15, 2021
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    112
    What I saw on headbolts.com was a set of 14, 7-long and 7-short in 7/16" size, are yours 7/16" or 1/2" and they do mention the kit may not have the stud for valve cover/accessories.

    Their descrption:
    L6 4.2 liter (258) jeep 7/16 thread bolts 7 long 4.5 uhl 7 short 3.750 arp bolts with arp cylinder head washers please check thread sizes before ordering these do not have studs on top that may be needed for valve cover / accessory's for example casting numbers 89330000 we have found that in some cases model 4.2 may use the 1/2 thread bolts

    torque is 70 foot pounds done in three steps 30 55 then 70 ft pounds with arp lube included in kit. Cylinder head washer goes inner chamfer side up

    They do show a kit with 1/2" bolts that does have the 2-stud bolts. Their part # is chbs-1128. You will need to verify!


    # 146-3603
     
  5. Jan 11, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Why do you want new ones? Unless the TSM tells me to replace them, I would reuse the old ones.

    Yes, there are some years with 7/16" bolts and some with 1/2". Depends on the year.
     
  6. Jan 11, 2022
    HarvestGold

    HarvestGold New Member

    Nebraska
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    Nov 13, 2020
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    I went out to the shop and measured the head bolts, they are as follows:

    Quantity 10: 1/2" diameter, 3-3/4" long from top of head

    Quantity 3: 1/2" diameter 3-5/8" long from top of head with top threaded part 7/16" diameter 1" long

    I wouldn't be averse to reusing them, if it's not a bad idea. However I bought this Jeep out of my neighbor's field where it had been sitting for over twenty years, so I don't know its history.
     
  7. Jan 12, 2022
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    Sep 23, 2002
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    12,529
    Unless they are torque to yield bolts which is unlikely in this year, or they are damaged somehow, no reason to not reuse the original bolts. Common and accepted practice.
     
  8. Jan 12, 2022
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Make sure both bolts and block are cleaned well. Even can run a tap and die on them to be sure.
     
  9. Jan 13, 2022
    HarvestGold

    HarvestGold New Member

    Nebraska
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    Nov 13, 2020
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    38
    Thank you all for the advice, I will be reusing the head bolts.
     
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