Can you change Head studs 1 at a time?

sweetdiesel

That's better
Aug 6, 2006
10,390
0
0
52
Thailand
Not to hijack the thread, there seems to be a lot of people out there who replaces the head studs without re-boring the block. Right or wrong, how many trucks have had failures for not boring the block with the head studs in place?The real question is "Are you willing to take the chance" The 625 head studs require 25 more lbs. of torque then the standard ARP head studs. Do you think the 25 more lbs. is really going to deform the cylinder? Sorry for the dumb question.:eek:

John has seen distortion from ARP installs and posted about it.

Personally when he says something, I tend to take it as GOOD INFO
and appreciate that he would give that advice.

Lots of people including myself have not used plates......I myself regret not doing it.

Do ya feel lucky? Because its really your choice.
 

jckleewein

New member
Dec 13, 2008
422
0
0
Broomfield, Colorado
I realize that, and really appreciate the information that was provided. I am trying to make a good decision based off of facts. There are a lot of expects on this site that have been very helpful, and I am sure there are a lot of other people that have found this information useful.

I need to find out if the block was honed with the stud in or out. Cross my fingers.
 
Last edited:

sweetdiesel

That's better
Aug 6, 2006
10,390
0
0
52
Thailand
I realize that, and really appreciate the information that was provided. I am trying to make a good decision based off of facts. There are a lot of expects on this site that have been very helpful, and I am sure there are a lot of other people that have found this information useful.

I need to find out if the block was honed with the stud in or out. Cross my fingers.

Not a lot of plates for the duramax around so unless the machine has done a duramax before chances are slim

I know SoCal sells the plates for the heads ready to go.
 

Rhall

Old Skooler
Aug 12, 2006
2,241
0
36
41
Texas Y'all
What John posted is the absolute truth , and is 100% the proper way to do it , but alot of poeple have gotten away with putting studs in with out doing a torque plate / hone I am one of them, but I do believe you give up some power as a result of the bore not sealing as well and there is a chance of studs higher torque spec, deforming the cylinder wall, and making the cylinder wall contact the piston skirt. So in short there is no free lunch and make decisions accordingly because it is not with out risk . But anyone ( no offense intended ) who thinks they will only build a motor once, or it will never fail if you through enough money at it , or it will never have to come back out is either (A) never going to push it hard or (B) hasn't followed the track record of built motors failing.


x2 on that! It never ends!:D
 

custom8726

Active member
Feb 25, 2008
2,784
0
36
Upstate N.Y
I was just at the engine shop today discussing this very issue, I was not aware head studs could create as much distortion as they do. Without seeing the trq plates in person today, I would still be scratching my head trying to figure out how you check for distortion. Point being, before I seen and understood the process, I would have just installed my ARP's and called it good, now after my brief edge-ah-macation today, I would not feel comfortable installing Head Studs without the bore honing..
 

LBZ

Super Moderator
Staff member
Jul 2, 2007
9,903
149
63
46
B.C.
Although I can't see torq plate honing being a bad thing to do, I'm not entirely sold on it. First off, Dmax blocks are stronger than cummins blocks simply by design. I'm sure everyone who has built a dmax has seen the hardening in the top of the cylinders-that stuff goes quite deep!!
Secondly, whose to say the amount the block distorts is the same everytime it is torqued down? Different torq wrenches can have different results in actual torq applied to studs. Different temperatures also can affect it upon assembly.

I dunno, just my take on it. Maybe better safe than sorry? Or not a problem? I know of a few high hp engines that weren't done-no issues to date. Maybe those guys will post up why they didn't do it.
 

1chevy02

New member
Jun 23, 2009
504
0
0
That video of him pushing on the side of the cummings block and making the block flex was pretty impressive:eek: Defiantly have to try that sometime. Sure puts a whole new perspective on block distortion
 

1chevy02

New member
Jun 23, 2009
504
0
0
Although I can't see torq plate honing being a bad thing to do, I'm not entirely sold on it. First off, Dmax blocks are stronger than cummins blocks simply by design. I'm sure everyone who has built a dmax has seen the hardening in the top of the cylinders-that stuff goes quite deep!!
Secondly, whose to say the amount the block distorts is the same everytime it is torqued down? Different torq wrenches can have different results in actual torq applied to studs. Different temperatures also can affect it upon assembly.

I dunno, just my take on it. Maybe better safe than sorry? Or not a problem? I know of a few high hp engines that weren't done-no issues to date. Maybe those guys will post up why they didn't do it.
I have wondered about this also:confused: How can you be sure that you are distorting the block the same way every time. Or can you repeat the process and duplicate the same distortion every time?
 

LB7Diesel

Oh Boy!
Sep 3, 2006
1,355
0
0
Melbourne, F.L.
Is this torque plate just a diesel thing? I know a guy that builds aluminum GM LS race engines and I asked him if he does this. His responce was no. I'm just a lil confused on why we need to do it when it's not nessesary on an aluminum block studded engine.

Before anyone jumps my a$$ and say's the guy doesn't know what he's doing. He has a few of his engines that are running 8 sec 1/4's with no issues that I know of.
 

JD Dave

In way over my head
May 19, 2008
2,388
0
0
Caledon, Ontario
Talked to Guy today and asked him about changing out my regular ARP's for 625's. I told him I'm putting big twins on it, 120 over injectors and my goal is 1000 hp. I asked him if it was his truck would he do it and he said yes. So I'm planning on going with the 625's and hope for the best. I thank everyone for there input but it's a calculated risk I think I want to take. I'm going to sleep on it for a couple more nights before I decide 100% though.