dacuma

These bolts are junk, while doing my vortec head swap I bought these new. Stupid bolt strech at 50ft lbs. total crap do yourself a favor and get studs btw something happened to my buddy and his dad, low quality crap btw they came all loose in a box how nice lol I have to see if I can get my money back.

Killert

iTrader: (9)

Had no problems with mine. Aren't the torque to yield? If they are, They are suppose to stretch.

dacuma

Yeah but at 50 ft lbs ? torque to yield should be a lot higher than that, esp. Since torque specs are 68 ft lbs ,also it was just one bolt. Same thing happened to my buddy's dad these new bolts are a one time use only,very low quality. My buddy was torquing it down and said it didnt feel right. Sure enough it stretch, the only one. Trust me these are junk my buddy and his dad know bolts and torque turn, these are junk. I'm just giving my warning use arp and save yourself some time. I went with studs, I'm happy. But if not enjoy the gm performance bolts from Korea.

Killert

iTrader: (9)

You and your buddy really sound like you guys know what you're talking about, but almost everything torque to yield is one use only. Like I said, They are suppose to stretch. Oh and BTW, ALOT of GM stuff is made out of the states.

87350IROC

iTrader: (2)

First of all, ALL bolts stretch when you tighten them, that is how bolted joints work. The difference is in a torque to yield application the bolt is permanently stretched. This is called plastic deformation. This will feel different. Bolts that are torqued to yield are one time use.

In a normal joint the bolt is not torqued to the point of plastic deformation. This is called elastic deformation. So when you remove the bolt, it remains at its original length.

Now it sounds like you are working on a SBC. SBC head bolts are NOT torque to yield. So, dacuma, are you saying the bolts are permanently stretched? If so, how did you determine that?

John

dacuma

Yeah just one of them, it Permanently stretched, my buddy pulled it out and compared it to the other bolts, you could see it was longer/stretched. Yeah it happened on the second pass, of the torque sequence. It was the only one that did it. It was just a bad bolt, We weren't doing torque to yeild, just 68 ft lbs. This one crap out at like 50 ft lbs,(actullay less than that the torque wrench we used was under torque the bolts lol) So I borrowed my buddys million dollar snap on one when we did the studs. so it happened at less than 50 ft lbs.

dacuma

Yeah we weren't doing torque to yeild on this one, it's too old lol but my buddy and his dad were doing it on a ls1 motor (Torque to yeild) and thats when it happened to them, they could see the bolt twist and not torque(they had it marked and could see the bolt twist back in place!!!) same deal they had new gm bolts! So I Followed their lead for peace of mind and Arp Studs.

TTOP350

iTrader: (8)

Sooo you had 1 bad bolt and you replaced all of them with studs???
I have had 1 ARP stud break before, also have had ARP nuts, bolts and other stuff come not threaded..
It happens now and then, rare but it happens to anyone who makes/sells parts.
I would have just gotten a new bolt from GM.

dacuma

Hell Yeah it's not baseball, their not getting 3 strikes from me, lol first thing was the fact they were all loose on the box(tread sealent was chipped off on half the bolts) they were just throw in there. I got both heads on the block ready to go, then a junk bolt! WTF! (Im at the point of no return) I order them online plus it was late so even if I got it from the dealer I can only work on it on Sunday , they would have been closed. With the way they were packed in the first place and this also happened to my buddy screw that. I only plan to do this once, but if I have to do it again I know I don't have to get new hardware I could have got a new bolt from them but what's to say any of the other ones I have wouldn't do the same thing (what if bad batch). Thank goodness it was on the first head. Plus I was pissed lol yeah I know extreme but that's how I roll lol

Eagle223usa

I used them on my IROC. No problems.

TTOP350

iTrader: (8)

If you saw how ARPs are handled befor they are packed you'd be surprised!
GM gets the bolts the same way they ship em out to us but in bulk, all in a big crate, loose!!! That sealant they use works very well, even if its chipped up a bit.
I have used about 6-7 sets of these and never had a problem...
You got it fixed and thats all thats important.

dacuma

Great how long ago was that?

dacuma

Yeah i know, I was so ticked. I was about to turn green and throw the car lol, yeah the heads torque down so nice with the studs, and the million dollar wrench lol Snap on. Yeah I just felt better to see them packed separately lol now got to get this beast together is the next feat lol

dacuma

Yeah I need to get build tread open up for you guys I'll try to do it in the next couple of days.

Eagle223usa

2 years or so...

90camaro355rs

dacuma, you do realize you should torque your head bolts in three steps right, you don't just go straight to 68 ft lbs. go 35 first pass 50 second pass then 68 third pass. this pulls the head and bolts down in an even pattern, much easier on the bolts, does take longer to do, better if your using aluminum heads, takes away the pulling headers and valve train to re torque after engine is at operating temp.

oh btw watch how they are made, you will see how the head bolts are handled after they are made.