So basically what you're saying LR... is that Mr Lorimer, former GM fastener engineer, is wrong?

The joint doesn't matter... no clamping forces are lost to creep and relaxation?

Wow... I'm speechless...

-Mindgame

 

This is why ARP doesn't offer stretch values any more.They told me today when I called that most people don't understand the difference and they were getting to many call's about it.
I am not disputing anything from GM,but he is using frictional torque values not stretch values.The engineer's at ARP and Fel Pro can figure the bolt stretch values but I can't,I have to have a book.
I'll bet if you ask your GM engineer what about stretch values,he would tell you there is a difference.You are using two different methods and trying to intertwine them and you can't.
I am just telling you what I have seen and done and trying to tell you how it works.I don't have any reference materal from the net to show,I just know it works,and that is good enough for me. Personally a torque reanch is the simpleist way if you have trial and errored it (both methods)to know how much to overtorque it to make a gasket hold.
Why don't you call Fel Pro and talk to an engineer named Jerry Rosenquist and ask him what they recommend for torque on a 1/2" stud on their 1011-1 and I bet it is at least 25-30ftlb's more than what ARP recommends.They do this to overcome rotational friction to achieve the clamping force (stretch)needed and people understand a torque wrench.They will also tell you they don't recommend any of their gaskets for NO.Will I happen to be holding a few gaskets with stretch,Soooo I don't know.

 

No sir, he's using torque to angle and joint conditioning to ensure more equal clamping loads. Did you read the information I posted? All of that revolves around TTA procedures... TTA doesn't rely on "friction". The bolt cycling involves friction, can't seperate the two, but it is a means to an end and that end is conditioning.

Not getting any direct answers, so on to other things...

LR,
Do you do your own boring and honing? Dave said something about you being retired but didn't say from what.

-Mindgame

 

But is it neccessary to retorque the heads???
The factory doesn't do it for millions of their vehicles, even high performance models. So I wouldn't loose any sleep over the issue.

 

Are you using exactly the same gaskets the manufacturer used for your rebuild? If not, then why compare the two.

Other than that... your answer was covered on page 1 of this thread.

-Mindgame