R ARP head bolts reusable?

[HoofnIt]

I know that the factory bolts can only be used one time but can I reuse the ARP fasteners?
THX

 

[nmcgrawj]

Yes.

 

[Zero Signal]

ARP says you can use them 3 times, but I'd bet you would be safe for quite a few uses.

 

[mustangt562]

?

why test it? if it causes you trouble in the future and you have to tear it down you are gonna wish you woulda spent the few bucks and got new ones.

 

[TMC]

No testing required...ARP did that. I use them 3-5 times before putting a new set in and have never had a problem.

 

[5spd GT]

I'm going to reuse mine here in a couple weeks...I'm not even worried about it.

 

[mo_dingo]

Yeah the only reason the factory bolts are un-usable is b/c they are torque to yield, i.e. you torque it to a specific setting, then use a special dial to turn the bolt a specific amount of degrees to yield the final torque.

I don't see why you couldn't use the ARP bolts over and over again...
Scott

 

[Rootus]

Heck, even the factory ones can be reused in a pinch. Definitely you can reuse the ARP's.

 

[HoofnIt]

Thanks guys! It looks like I'm going to be putting in a DSS 306 Pro Bullet short block within the next couple of weeks so I am trying to limit how much this endeavor costs.

 

[Yobi1Kanobi]

i would have used my arp bolts if it wasnt that I am going to studs...You can use a micrometer and measure the bolts and check them..they have a certain tolerance calling arp will give you their figures. The only reason u cant reuse them is if they are overstreched...

 

[Zero Signal]

You need to realize how steel works and what torque to yield means . . .

Steel is almost perfectly elastic (meaning it returns to it's initial state if stretched) untill it reaches 'Fy' (yield stress). Yield stress indicates the point at which any more stress will induce plastic deformation. In other words, once you remove the stress, it will have a certain amount of permanent (inelastic) deformation.

ARP head bolts are made of a high tensile strength steel. They have an Fy of something like 180,000 psi where your typical steel building is only made of 50,000 psi steel. Typical bolts are around 80,000 psi yield. So you would need to put twice as much torque on the bolt to actually get it to yield. So in theory, you can use it an infinite number of times. The fallacy in that is that your bolts go through heat cycles and vibration which DO have long term effects on the bolt strength.