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Old 01-19-2013, 01:59 PM   #1 (permalink)
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HELP!!! Stripped a head bolt on final torque.

My buddy and I were finishing up the installation of the heads. We were on the second head and the installation was going fine until we got to the final bolt. The tort procedure is in three stages. The number 9 bolt is the bolt in question. First we torqued the bolt to 22 foot-pounds then we useed our torque degree wheel to torque a further 90° and then finally torqued to 50°.


When we got to the last 50° of torque that's when my buddy noticed the tension on the wrench wasn't right. Sure enough we stripped out the head bolt.


I'm hoping there's someone out there that has purchased the GM thread restorer kit and would be willing to loan it to me so I can fix my block and finish the job.

The thing that is the real kick in the nuts is; we were on the home stretch of this engine rebuild and I was looking forward to starting the engine this weekend. I guess I will have to wait a bit longer.

Thanks for your help in advance,

dejected Dave
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Old 01-19-2013, 02:17 PM   #2 (permalink)
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Re: HELP!!! Stripped a head bolt on final torque.

A helicoil is the only way to repair the block. A word of advice, throw those torque to yield head bolts as far as you can and install ARP studs. Install the heads and torque the nuts as you would an old style head bolt.

Upon giving this some thought, I think you might have had some fluid in that bolt hole.
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Old 01-19-2013, 02:30 PM   #3 (permalink)
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Re: HELP!!! Stripped a head bolt on final torque.

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Originally Posted by jub jub View Post
A helicoil is the only way to repair the block. A word of advice, throw those torque to yield head bolts as far as you can and install ARP studs. Install the heads and torque the nuts as you would an old style head bolt.

Upon giving this some thought, I think you might have had some fluid in that bolt hole.
A helicoil comes in the kit. Usually several. I'm hoping someone has the kit and extre helicoils.

I blew out the thread hole with compressed air with a long straw type tube from the bottom to the top. It was clear. The block threads just let go. It happens, unfortunately.
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Old 01-19-2013, 08:30 PM   #4 (permalink)
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Re: HELP!!! Stripped a head bolt on final torque.

That bolt looks dry. Did you use any oil or other type of lubricant when you were torquing them down? You need to use something as the stiction is really strong when you don't. The lubricant gives you accurate torque readings.
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Old 01-19-2013, 08:57 PM   #5 (permalink)
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Re: HELP!!! Stripped a head bolt on final torque.

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That bolt looks dry. Did you use any oil or other type of lubricant when you were torquing them down? You need to use something as the stiction is really strong when you don't. The lubricant gives you accurate torque readings.
The manual didn't call for any type of lube.
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Old 01-20-2013, 08:22 AM   #6 (permalink)
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Re: HELP!!! Stripped a head bolt on final torque.

I found a Time-Sert kit on eBay for $175 shipped. Thanks anyway.
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Old 01-20-2013, 08:37 AM   #7 (permalink)
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Re: HELP!!! Stripped a head bolt on final torque.

The damage may have already been there from the previous owner.

As far as the lube goes. Many use regular engine oil but I used a product specific to head bolts. If memory serves me right, it's made by ARP.
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Old 01-20-2013, 06:58 PM   #8 (permalink)
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Re: HELP!!! Stripped a head bolt on final torque.

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The damage may have already been there from the previous owner.

As far as the lube goes. Many use regular engine oil but I used a product specific to head bolts. If memory serves me right, it's made by ARP.
That sounds like a good theory, let's go with that. Everything else was caused by the donkey I bought the car from.
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Old 01-20-2013, 07:28 PM   #9 (permalink)
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Re: HELP!!! Stripped a head bolt on final torque.

That really sucks. I sure hope this is the last problem you run into on reassembly.
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Old 01-21-2013, 06:53 AM   #10 (permalink)
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Re: HELP!!! Stripped a head bolt on final torque.

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That really sucks. I sure hope this is the last problem you run into on reassembly.
You know, it's all good. Over the last three months I've learned more about cars than I have in my entire lifetime. So In a way, a weird way. I guess I need to thank the donkey who sold me the car. Oh ya one more thing, thank him and send him a bill for $3000
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Old 01-21-2013, 08:39 AM   #11 (permalink)
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Re: HELP!!! Stripped a head bolt on final torque.

Sending you a pm on the importance of lubrication while torquing. Check it out.
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