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main bolts

  1. #1
    I'm No Expert Shaun's Avatar
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    Default main bolts

    One of my main bolts, #4 main on the outside is tight when trying to screw it down. it was tight before but feels worse now. I put another bolt from another cap there and it went in fine. Looking at the bolt i can see the first thread looks shiny like maybe it's been eaten, also the bottom part of the bolt is not flat kinda wavey. I'm worried that with the extra tension to drive the bolt down that maybe it would affect the torque. Not sure if this is critical or not. Can i just chase the bolt with a die? Is it 1/2-13, looks like it.

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    gn7
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    Quote Originally Posted by Shaun View Post
    One of my main bolts, #4 main on the outside is tight when trying to screw it down. it was tight before but feels worse now. I put another bolt from another cap there and it went in fine. Looking at the bolt i can see the first thread looks shiny like maybe it's been eaten, also the bottom part of the bolt is not flat kinda wavey. I'm worried that with the extra tension to drive the bolt down that maybe it would affect the torque. Not sure if this is critical or not. Can i just chase the bolt with a die? Is it 1/2-13, looks like it.
    Yes, but don't run the die up the threads any further than you have to. The thread on those bolts are rolled, not cut. Won't be a problem if it's the first couple of threads on the bolt. Some times you clean up a small problem on a wire wheel, just get nuts, and stay on the end of the bolt. I assume that bolt is same in any of the holes.



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    I'm No Expert Shaun's Avatar
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    Ya, tried the bolt on another hole and it was even tighter feeling.

    1/2-13 is the size/thread right?

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    I'm No Expert Shaun's Avatar
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    chased the first 3 threads and it slides right in now!

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    Senior Member Pattymelt18's Avatar
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    Quote Originally Posted by gn7 View Post
    . The thread on those bolts are rolled, not cut. Won't be a .

    What does this mean?

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    Quote Originally Posted by Pattymelt18 View Post
    What does this mean?
    Instead of using threading dies that cut the metal, the threads are formed by rollers that actually roll the threads in the steel rather than cut it. Sort of like a tubing cutter.
    It's on a much larger scale, but this will give you an idea.

    Last edited by scott foxwell; 04-07-2009 at 09:23 PM.
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    Quote Originally Posted by Pattymelt18 View Post
    What does this mean?

    Rolling the thread instead of cutting, helps prevent the bolt from developing micro stress cracks and eventually shearing. This was originally developed for early aero engines.


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    A rolled thread is something like 300 % stronger than a cut thread.
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    Shaun, I personally would not re-use that bolt. If it has issues threading into the block then you might consider that it already has been "stretched' enough and has done all it can! If you need to clean threads to make it run into the block---- WHY-- If it were me I would stud the mains and not worry! IMLAO Mark

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    Quote Originally Posted by ol guy View Post
    Shaun, I personally would not re-use that bolt. If it has issues threading into the block then you might consider that it already has been "stretched' enough and has done all it can! If you need to clean threads to make it run into the block---- WHY-- If it were me I would stud the mains and not worry! IMLAO Mark
    Good point, and good advice
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    I'm No Expert Shaun's Avatar
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    Hmm, want to say that my last build i asked about studs and i got quiet a few responses that studs are not needed. Something about they don't help at all preventing walk and sounded like the standard GM bolts were fine. So... not knowing the life of these bolts and one being damanged... should i go with ARP bolts or are studs really worth it. Double the price.

  15. #13
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    Don't stud it now.
    You want bolts? How many do you want? I will send them.

  16. #14
    gn7
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    Quote Originally Posted by ol guy View Post
    Shaun, I personally would not re-use that bolt. If it has issues threading into the block then you might consider that it already has been "stretched' enough and has done all it can! If you need to clean threads to make it run into the block---- WHY-- If it were me I would stud the mains and not worry! IMLAO Mark
    It sounds to me like the end threads got boogered up. How the hell do you strectch the end threads of a bolt with out stretching the rest? I have seen bolts stretch where only the bottom threads were stretched, because there aren't/weren't engaged in hole threads. But have NEVER seen an end 2 thereads stretch and leave the rest fine. That would be a trick!



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