Pulling heads. Do you replace the head bolts?
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Pulling heads. Do you replace the head bolts?

  1. #1
    Senior Member Delemorte's Avatar
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    Default Pulling heads. Do you replace the head bolts? UPDATE pg. 2

    Subject says it all..


    SBC 350. engine runs great so i want to eliminate the possibility of a head gasket on backwards or some other blocakge. Easy enough to pull the heads and put new gaskets in.. '

    Do you reuse the old bolts or toss them and buy new?
    Last edited by Delemorte; 02-07-2009 at 06:58 PM.
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    man, you can get a nice set of manley sbc headbolts so cheap offa ebay these days, it'd be hard not to justify it.

    Dare to be different, if it turns out great you can claim you planned it that way.

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    If you like spending money. I reuse mine all the time. Some of the new GM stuff says not to reuse as they are torque to yield. Any one know what that means?

    Tim

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Torque-to-yield means that the bolts have been tightened to the point that they are stretching to their limit.
    A high preload is achieved by tightening up to the yield point of the fastener material.

    This actually over-stresses the bolt, and ruins it for re-use.

    To do this consistently requires special equipment that monitors the tightening process. Basically, as the tightening is being completed the equipment monitors the torque verses angle of rotation of the fastener. When it deviates from a specified gradient by a certain amount the tool stops the tightening process. The deviation from a specified gradient indicates that the fastener material as yielded.

    from boltscience.com.
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    The Man cordog009's Avatar
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    Speaking of this...how long are head studs good for? I'm thinking about picking up some ARP studs.


    1984 Youngblood TX-19 SOLD

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    Senior Member Delemorte's Avatar
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    Quote Originally Posted by SmokinLowriderSS View Post
    Torque-to-yield means that the bolts have been tightened to the point that they are stretching to their limit.
    A high preload is achieved by tightening up to the yield point of the fastener material.

    This actually over-stresses the bolt, and ruins it for re-use.

    To do this consistently requires special equipment that monitors the tightening process. Basically, as the tightening is being completed the equipment monitors the torque verses angle of rotation of the fastener. When it deviates from a specified gradient by a certain amount the tool stops the tightening process. The deviation from a specified gradient indicates that the fastener material as yielded.

    from boltscience.com.

    So what your saying is spend the 60 bucks its worth it.. i look at ARP studs but they are like double or triple the price.... For a naturally asperated small block i did not know if that was worth it or not.
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

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    The Man cordog009's Avatar
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    Quote Originally Posted by Delemorte View Post
    So what your saying is spend the 60 bucks its worth it.. i look at ARP studs but they are like double or triple the price.... For a naturally asperated small block i did not know if that was worth it or not.

    Here's some Manleys for $44. Cheap insurance. For a N/A smallblock studs are overkill.

    http://cgi.ebay.com/ebaymotors/MANLE...spagenameZWDVW


    1984 Youngblood TX-19 SOLD

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    Boat Nut sleekcrafter's Avatar
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    Cheap enough for sure, looked at these....how do they do it?

    http://cgi.ebay.com/ebaymotors/PROCO...mZ330301063937

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by Delemorte View Post
    Subject says it all..


    SBC 350. engine runs great so i want to eliminate the possibility of a head gasket on backwards or some other blocakge. Easy enough to pull the heads and put new gaskets in.. '

    Do you reuse the old bolts or toss them and buy new?
    What year and torque spec for your'e application. That would have to do alot with dispose or reuse!M

  12. #10
    steelcomp was here
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    Default Buyer be Ware!

    Just as a warning...one of the biggest counterfeit markets in this country is hardware. I wouldn't buy a bolt off ebay (unless its from someone reputable) if my life depended on it, and even then I'd be sceptical. The aerospace industry got it's ass kicked by hardware counterfeiters, SO- if you think it's easy to spot, think again. Chances are your stockers are fine, but to take a chance and buy bolts on ebay, forget it.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Distinguished Member David 519's Avatar
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    Mild performance application, reuse the head bolts. Though I've never tested it, I'd bet you'd pull the threads out of a GM SBC before you'd yeild a head bolt....
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

    Quote Originally Posted by fuelinmyveins82 View Post
    .....I think people forget that racing is supposed to fun. Losing shouldn't be discouraging it should motivate you work on your pile to make it faster.....

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by steelcomp View Post
    Just as a warning...one of the biggest counterfeit markets in this country is hardware. I wouldn't buy a bolt off ebay (unless its from someone reputable) if my life depended on it, and even then I'd be sceptical. The aerospace industry got it's ass kicked by hardware counterfeiters, SO- if you think it's easy to spot, think again. Chances are your stockers are fine, but to take a chance and buy bolts on ebay, forget it.
    Double ditto X-2.

  15. #13
    Senior Member ol guy's Avatar
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    David 519 has a very good point, (as does s/c) you are more likely to pull the threads out of the block before over "stretching" a sbc head bolt. I will admit that some of the newer stuff, as-in O.E. recommends bolt replacement for retorque but we are talking about a sbc and who can rebuild perfection. The design of the small block will never EVER be matched. IMLAO

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    Renegade jet tunneljet's Avatar
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    I would buy the arp studs, easier to remove heads in future and are much stronger.

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