I torqued mine to 85, but I beleive my tq wrench ends up a couple lb light. No broken studs and no trouble

 

They seem to work ok had them in my cheap block tq to 90 and had no issues now the real arps well that's a different story..........

 

So, tell the real aro story, plz.

 

Interesting reading! I have snapped a few of the procomps on a Gen1 SBC at 75lbs, but it was on the second time the engine was put together.

 

Like I said back in post 43...

Over torquing a stud to 90lbs that is rated for 70lbs will result in less clamping force. Going over the yield point of a fastener (max stretch point) will permanently deform the bolt and weaken the clamping force. (or just break)

Same goes for ARP. Just because it doesn't break at 90ftlbs+ doesn't mean it's holding the head down better.

 

I've used them 3 times works great my 5.3 is at 19# of boost going strong and I just got a set for my ls3 also

 

Who says these things are rated for 70ftlbs?
Mine came with NO instructions - typical of chineese stuff. They claim them to be 8740 material, like the ARP's, so I torqued to acheive 80ftlbs like ARP wants their 8740 studs tq'd to.

 

It's on the ebay page that sells them.

http://www.ebay.com/itm/221332526450...84.m1439.l2649





The ARP instructions said to use these values with ARP lube....

And these values with motor oil.

Also I compared the ARP stud to the China stud and the black oxide on the ARP is much thicker. So 70ftlbs with arp lube probably over torqued them a bit.

Not that it won't "work", obviously it does. There are alot of variables people tend to ignore. I think thats why there are so many failures.

 

I got mine direct from Alper. no info there. I expected it in the box, nope.
If the Ebay site has acurate info then mine are over tq'd at 80. we will see how they hold up

 

That link I sent is Alper motorsports and they suggest 70-75. I'm sure it will be fine. The fastest stock block 5.3 car (1/8th) that I spoke with torqued his to 75. Same alper studs. He runs 30psi through a T88 on his and has been 5.18 in the 1/8th at 138 on them. Thats the hardest I've seen them pushed. Said he tried to go to 80 and the stud wanted to twist, so he left it.

http://www.yellowbullet.com/forum/sh...d.php?t=603924

 

Didn't torque the arps to that just was saying what was done on the cheap jy motor. The arps were torqud to spec and one snapped off before I got to finish my third pass
I was watching the gauge snapped about 60-65ft lbs

 

I got a set of the Alper's as well. The quality leaves a bit to be desired as four of the large nuts were not threaded perpendicular to the stud and the pressure face would "wobble" as you rotated it. Alper was more than happy to send me four more nuts and they were perfect. Overall I've very happy with them for the price.

I haven't passed any boost through them yet but they torqued down just fine with ARP lube to 75lbft.

 

Good info....so just to reiterate, the Alper studs "should" be good to 75 lbs using ARP lube correct?

 

Yes. And make sure you check the flatness of the pressure face of the nut while spinning it on the stud. Four of mine were not square.

 

^^thanks for the heads up.

 

Arp bases their torque rating at 80% of yield of the stud. I'm sure there is some variance if somebody is using a $500 snap on digital torque wrench or a $15 one from HF.

 

I've used ARP and the Alper motorsports one. Got a 900rwhp nitrous vette, my "beater" 97 (540whp on one kit), and my single turbo camaro running the Alpers, no issues whatsoever on the performance side. The only thing I dont like is the smaller studs dont have a hex bit slot to tighten them into the block with, gonna use your fingers.

 

I know this is not a wrench thread but just FYI.

Snap on wrenches can be out of tolerance just as well as the HF ones. I have used and calibrated both . Both keep their accuracy over long term the same. At work, last week, we got 6 Snap on wrenches brand new that would not pass initial calibration specs. They were very non-linear. The new digital wrenches from snap on are actually 1% and asre dead on the $$ for accuracy. I highly recommend them.

 

Also a good point. My Torque wrench was certified and in spec through my work.

 

We have a more house press that can put tension and force on parts at work. Just need to convince my boss to let me test some studs at work to see how they perform far as stretch and if the nuts or stud threads fail first. ;-)