340 Head Bolt Question

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    Author Topic: 340 Head Bolt Question  (Read 1771 times)

    Offline cwestra

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    340 Head Bolt Question
    « on: September 07, 2009 - 01:10:31 PM »
    Do any of the head bolts go into water jackets on a small block 340 engine?
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    Corey - in Northern Indiana


    Offline Chryco Psycho

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    Re: 340 Head Bolt Question
    « Reply #1 on: September 07, 2009 - 01:39:52 PM »
    no , that is a chevy thing , just the exhaust studs on the ends of the heads
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    Challenger - You`ll wish You Hadn`t

    Offline cwestra

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    Re: 340 Head Bolt Question
    « Reply #2 on: September 07, 2009 - 01:44:08 PM »
    Quote from: Chryco Psycho on September 07, 2009 - 01:39:52 PM
    no , that is a chevy thing , just the exhaust studs on the ends of the heads
    Great.  Thanks for the quick reply CP. 
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    Corey - in Northern Indiana

    Offline Chryco Psycho

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    Re: 340 Head Bolt Question
    « Reply #3 on: September 07, 2009 - 02:13:36 PM »
    No Prob :2thumbs:
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    Challenger - You`ll wish You Hadn`t

    Offline Moparal

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    Re: 340 Head Bolt Question
    « Reply #4 on: September 07, 2009 - 04:47:16 PM »
    As I recall there is one on each side that does. I believe the manual says to put sealant on that bolt too. But it's been a long time.  I do remember 1 long bolt on a 340 head bolt leaking water, it was into the valve cover
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    Offline cwestra

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    Re: 340 Head Bolt Question
    « Reply #5 on: September 07, 2009 - 08:04:28 PM »
    How critical is it that sealant be applied to the bolt?
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    Corey - in Northern Indiana

    Offline Moparal

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    Re: 340 Head Bolt Question
    « Reply #6 on: September 07, 2009 - 08:10:02 PM »
    Some leak and some dont.  I have seen them leak after doing a valve job and re installing the heads. That's where I read it in the manual.  My friend found water in his oil one time after a rebuild and it was the same head bolt.
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    Offline cwestra

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    Re: 340 Head Bolt Question
    « Reply #7 on: September 07, 2009 - 08:12:43 PM »
    Quote from: Moparal on September 07, 2009 - 08:10:02 PM
    Some leak and some dont.  I have seen them leak after doing a valve job and re installing the heads. That's where I read it in the manual.  My friend found water in his oil one time after a rebuild and it was the same head bolt.
    Mine are already tightened.  Is it too late to run that center (long) bolt out and put sealer on it?
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    Corey - in Northern Indiana

    Offline Moparal

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    Re: 340 Head Bolt Question
    « Reply #8 on: September 07, 2009 - 08:14:10 PM »
    no it's not to late. And I would do it. I sure wish some small  block guys would chime in for you. But I am pretty sure of this
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    wagesofsin

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    Re: 340 Head Bolt Question
    « Reply #9 on: September 07, 2009 - 08:34:20 PM »
    Quote from: Moparal on September 07, 2009 - 08:14:10 PM
    no it's not to late. And I would do it. I sure wish some small  block guys would chime in for you. But I am pretty sure of this


    yes, you can remove it and apply some good rtv, you should have no further issues.
    just stuff the threads good.
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    Offline cwestra

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    Re: 340 Head Bolt Question
    « Reply #10 on: September 09, 2009 - 12:43:10 PM »
    Quote from: wagesofsin on September 07, 2009 - 08:34:20 PM

    yes, you can remove it and apply some good rtv, you should have no further issues.
    just stuff the threads good.
    You wouldn't happen to know which bolt(s) are affected on my 340 do you? 
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    Corey - in Northern Indiana

    Offline moper

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    Re: 340 Head Bolt Question
    « Reply #11 on: September 10, 2009 - 12:45:59 PM »
    No small or big block mopar head bolts bolts hit water. They are all blind holes. Especially with small blocks, the holes should be fully bottom tapped and blown clean, and the bolt threads should be chased. If the block or heads have been milled, make sure teh bolts are not bottoming out in the holes as the depth can vary hole to hole by a bit. Start them by hand, lubing the threads with straight 30W oil, and torque evenly and smoothly in 3 increments to the spec (95lbs?). The last pull should turn the bolt more than 90° and should be done smoothly to the correct torque.
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    Offline cwestra

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    Re: 340 Head Bolt Question
    « Reply #12 on: September 10, 2009 - 12:56:16 PM »
    Quote from: moper on September 10, 2009 - 12:45:59 PM
    No small or big block mopar head bolts bolts hit water. They are all blind holes. Especially with small blocks, the holes should be fully bottom tapped and blown clean, and the bolt threads should be chased. If the block or heads have been milled, make sure teh bolts are not bottoming out in the holes as the depth can vary hole to hole by a bit. Start them by hand, lubing the threads with straight 30W oil, and torque evenly and smoothly in 3 increments to the spec (95lbs?). The last pull should turn the bolt more than 90° and should be done smoothly to the correct torque.
    Great.  Thanks for the details, moper.
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    Corey - in Northern Indiana
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