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One stripped thread during head install

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Old Apr 16, 2006 | 09:12 PM
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Default One stripped thread during head install

Help, I have been working on this motor forever. It has been completely rebuilt, and I was nearly done. I am using ARP head studs. One of the very last studs pulled the threads right out of the block.
How in the heck do I fix this? It is so deep into the block before the threads even grab. I believe there is not even a tap for this thread size.
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Old Apr 16, 2006 | 10:01 PM
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Originally Posted by jfrc
Help, I have been working on this motor forever. It has been completely rebuilt, and I was nearly done. I am using ARP head studs. One of the very last studs pulled the threads right out of the block.
How in the heck do I fix this? It is so deep into the block before the threads even grab. I believe there is not even a tap for this thread size.
I don't know if this will help, but GM has a thread repair kit for the head bolts. It's either that or you will have to get the block to a machine shop to have a helicoil installed.
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Old Apr 16, 2006 | 10:14 PM
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does anybody know the part number? I wonder if it is a helicoil kit?
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Old Apr 17, 2006 | 08:32 AM
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You need to heli-coil the thread. The tool part # depends on which hole it is in the tightening sequence, which one is it?
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Old Apr 17, 2006 | 08:40 AM
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on the right (passenger side), 4th hole back on the top of the cylinder
on the GM torque procedures, it would #3
it's the deep hole, like the one I am in right now
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Old Apr 17, 2006 | 09:11 AM
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Here you go, good luck with the repair. Let us know how you make out. You might be able to get the stuff from Gene at Fred Beans. (Sorry its so big, but I wanted to make sure you can read it.)



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Old Apr 17, 2006 | 09:13 AM
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Check this too:

http://www.threadkits.com/timeserts/..._misckits.html
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Old Apr 17, 2006 | 10:38 AM
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great info
i appreciate your help
i will make a trip to the gm dealer @ lunch

this time i will only torque to only 20-25 ft lbs
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Old Apr 17, 2006 | 01:13 PM
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just got back from GM dealer
"we don't carry thread repair kits"
I showed him this catalog print out with part numbers
he had no clue
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Old Apr 17, 2006 | 01:53 PM
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Call Gene at Fred Beans. If he can't get it for you, contact the other link I put up. You should be able to get this. The other option is McMaster-Carr.
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Old Apr 17, 2006 | 07:42 PM
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I believe that these guys supply the tools for GM.

http://www.spxkentmoore.com/

Give them a call about those "J" parts numbers
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Old Apr 17, 2006 | 09:43 PM
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Originally Posted by jfrc
just got back from GM dealer
"we don't carry thread repair kits"
I showed him this catalog print out with part numbers
he had no clue

SPX Kent-Moore
Part number J42385-2030
M11x2.0 Cylinder Head Bolts
Northstar/Premium V8
Thread repair kit.

GM requires that their dealers have this kit on hand, it will cost them about $600. If they dont have it then you should RAT them out.
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