ARP head bolt broke off inside the block!!
Thread Starter
TECH Apprentice
Joined: Jul 2004
Posts: 375
Likes: 0
From: Carolina
If they are stronger, then how come they cant withstand the higher torque specs that the factory ones can?
Im not blameing arp, i am a little upset i didnt get torque spec instructions. Thats all. Just understand this isnt a pleasent experience and i dont trust an arp bolt after one broke off inside the block. Its not easy getting it out. Im going to pull my other head off this weekend and trash all the arp bolts and put my heads back on with stock bolts whenever i get the broke bolt out of my block.
Im not blameing arp, i am a little upset i didnt get torque spec instructions. Thats all. Just understand this isnt a pleasent experience and i dont trust an arp bolt after one broke off inside the block. Its not easy getting it out. Im going to pull my other head off this weekend and trash all the arp bolts and put my heads back on with stock bolts whenever i get the broke bolt out of my block.
Dude..... you STILL don't get it. ARP bolts ARE stronger. Period. They have a higher tensile strength to failure ratio than the stock TTY bolt. They do not NEED to be torque'd to a TTY spec to be a "stronger" piece.
Different grade bolts torque to different specs and are made to withstand given loads based on fastener material PLUS tq. spec.
The key words here are TTY. ARP'S are not TTY. Did you not know that?
We hate it for you, but just DAMN..... if you knew the difference, and didn't have tq. specs, common sense dictates you verify them BEFORE proceeding.
Not trying to be a dick and bust yer *****, but just hate to see someone blame someone else for THEIR ***** up.
Good luck!
Different grade bolts torque to different specs and are made to withstand given loads based on fastener material PLUS tq. spec.
The key words here are TTY. ARP'S are not TTY. Did you not know that?
We hate it for you, but just DAMN..... if you knew the difference, and didn't have tq. specs, common sense dictates you verify them BEFORE proceeding.
Not trying to be a dick and bust yer *****, but just hate to see someone blame someone else for THEIR ***** up.
Good luck!
Launching!
Joined: Oct 2003
Posts: 249
Likes: 0
From: Cary, NC/University Heights, OH
LowETz hinted at it when he mentioned tensile strength. There are different kinds of strengths, shearing, elongation, etc. Strength is not simply strength. Different kinds of strength are needed in different applications. I.e.; Certain types of windows are VERY strong if you were to hit them head on. But, if you hit them from the ends they would shatter very easy, especially when compared to the strength they have from the sides.
In short, you applied the wrong kind of force to this bolt that it's not meant to endure AND WOULD NOT INCUR IN ITS APPLICATION. You needlessly overtwisted the damn thing. Is a little man sitting on the damn thing twisting it when you drive down the road? I think not. The stock bolt won't break when you do that because it is weaker and stretches and essentially distorts, which is why you can't use it again, which is why it can have that type and amount of strength applied to it.
You applied the wrong kind and amount of force (that it won't endure during it's application, so strength in this sense is mute) to a stronger bolt for the application it was meant.
In short, you applied the wrong kind of force to this bolt that it's not meant to endure AND WOULD NOT INCUR IN ITS APPLICATION. You needlessly overtwisted the damn thing. Is a little man sitting on the damn thing twisting it when you drive down the road? I think not. The stock bolt won't break when you do that because it is weaker and stretches and essentially distorts, which is why you can't use it again, which is why it can have that type and amount of strength applied to it.
You applied the wrong kind and amount of force (that it won't endure during it's application, so strength in this sense is mute) to a stronger bolt for the application it was meant.
Originally Posted by MakoLS1
If they are stronger, then how come they cant withstand the higher torque specs that the factory ones can?
A heat-treated part that has been tempered is some where in the middle and has characteristics of both mild steel and carbide.
If I were you, I would leave those other ARP bolts in there and just get one more to replace the one that broke.
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Registered User
Joined: Aug 2019
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Your broken head bolt,I need help in same position. 
ARP head bolt broke off inside the block!! it's on the bottom row, 2nd from the front. Its recessed about 3 in. in the block. Can't even see down in the hole to see if your going to drill centered and straight. I have a guy comming to look at it to bring a retracter rod and mabey weld inside the hole, like creating another head bolt then mabey twist it back out.
I know the bolt pattern and torque specs were done right. Do u think ARP wil do anything about this??? They are arp bolts...
How did you get the bolt out I have one stuck about 3 inches and I can not get it out.
