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ARP head bolts

Discussion in 'CJ' started by Duff, Feb 4, 2020.

  1. Feb 4, 2020 at 4:42 PM
    #1
    Duff

    #1
    Duff [OP] Well-Known Member

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    Is ARP # 146-3603 the correct head bolts for a stock 1985 258? I read some reviews and descriptions at Summit and am a little confused on this. My bolts are 7/16 and 2 different lengths. Thanks!
     
    Duff, Feb 4, 2020
    #1
  2. Feb 4, 2020 at 8:39 PM
    #2
    CZJ7

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    CZJ7 Jeep—rotating the earth since 1941

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    That’s the only kit on ARP’s website that lists the 7/16” bolts in two lengths. The confusing part is that they list the 258 with the 4.0 head, but not the stock head. I’m pretty sure they are the same bolt kit. I’d go with it.
     
    CZJ7, Feb 4, 2020
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  3. Feb 5, 2020 at 12:35 AM
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    Duff

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    Duff [OP] Well-Known Member

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    Yeah, the 4.0 head was the thing that threw me. I'll take your advice and order it today. Thanks!
     
    Duff, Feb 5, 2020
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  4. Feb 5, 2020 at 3:57 AM
    #4
    CZJ7

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    CZJ7 Jeep—rotating the earth since 1941

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    I thought of something else......I have a blown-up 4.0 from 2002. I can pull the valve cover and look and see if that one has 2 different length bolts. I just can’t do that until this evening. I’m confident it’s the right kit, I just hate to steer a guy wrong without checking everything I can. Worst case scenario is that you would have to return the set to ARP.
     
    CZJ7, Feb 5, 2020
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  5. Feb 5, 2020 at 5:22 AM
    #5
    Duff

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    Duff [OP] Well-Known Member

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    Thanks, but not necessary, I'm going to order this A.M. I also went on the official ARP site and their description also says with 4.0 head. 1 review on Summit recommended 146 3602, but that looks wrong to me. I'll take a chance on the 3603 kit and will post results. Thanks for the help.
     
    Duff, Feb 5, 2020
    #5
  6. Feb 29, 2020 at 12:53 AM
    #6
    Duff

    #6
    Duff [OP] Well-Known Member

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    # 146-3603 is the right kit for an AMC 258 engine with stock head and 2 different bolt lengths. Only thing I had to do, in order for it to lay flat, was trim the valve cover gasket around several of the new head bolts.
     
    Duff, Feb 29, 2020
    #6
  7. Feb 29, 2020 at 6:46 AM
    #7
    CZJ7

    #7
    CZJ7 Jeep—rotating the earth since 1941

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    :yes:
     
    CZJ7, Feb 29, 2020
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