studs are reusable from block to block as long as the threads on the studs/block are not ruined.

 

there is some NA use...aka...NOS+12:1 compression...

 

Basically, with a multilayer metal HG like the EJ's get...and the ARP's...i'd almost garuntee the HG's will never blow on an NA engine.

 

for turbo...I'd think it would take a TON of abuse before the HG's blew again.

would ea81 nuts and washers work?

 

Last week I pulled a nut off an EA81 and it threaded onto an EA82 head bolt.

i've read through this post and i guess i'm out of the loop...what do these head studs offer? are they only viable for forced induction applications? do they offer anything for NA engines? may consider a set for the XT6 if they are that good, seems to be alot of talk about them. ..

Any decent stud should be an improvement over a standard headbolt. They provide greater, more consistant and repeatable clamping force, and are less likely to strip the block threads. The ARP studs are probably overkill for most of us, but they are available, and so far no other real source of studs has been identified.

 

If I had my 'druthers, I would replace all bolts with studs (where practical), especially any that are threaded into aluminum. Some day, when I am rich...

could you use stock bolts as studs? just cut the top off? use the longer bolts for the *shorter* holes and possibly find longer one for the longer holes? i know that sounds crazy but studs seem easy enough to make.

 

how hard is it to buy stock and make your own? doesn't sound like fun, but doesn't sound hard either.

I have re-opened this topic with ARP.

keep us updated will.

Go Will Go!!!

Hey guys I sent Subarutex's head stud info to about 20 different fastener companies to try to get a good rounded price for a set of head studs for our roos. Hopefully the info goes through and I get a response very soon and hopefully they are lower then $500 HEHE. The only thing I am not totally sure about is if the thread tap size 11x1.25 is correct but I am not totally sure where the measurement is taken, at the deepest part of the thread or at the non threaded part of the bolt. Well I will let you know.

What about drilling and re-tapping the block for different size threads? If we could change the threading to a more standard size, wouldn't it bring the cost down?

This is actually what I was trying to find out from subarutex, what was the reason they did not have that stud size? Was it the thread count, stud length ect.. What?

It was the lenght of the stud for the long ones. They didnt have any 12x1.25 studs that long, and they would have to tool some up.

its 11x1.25.....

Doh! I knew that. 12x1.25 just sticks in my mind for some reason... lugnuts?

Doh! I knew that. 12x1.25 just sticks in my mind for some reason... lugnuts?

 

Yep.

they don't have any that long, that's surprising. studs aren't complicated. if you need 11 inch studs, then getting anything 11" or longer will work. cut them and clean the end up with a die, i've done it plenty of times. i worked at a plant that used to make studs/bolts all the time, it's really a simple process i can't believe it's this big of a deal. there has to be a shop or person out there that's willing to cut some stock the size you want..and not for the crazy prices they are asking.

I am going to ask my F-15E aircraft metals tech guys how much of a big deal it would be to do this and about how much it would REALLY cost. I am also going to see if they can make sure that is the correct thread count(not trying to undermine any previous measurements just want to make sure they are correct!)

If I remember from reading all these threads, the ARP price was based on an 11x1.25 pitch, which seems like a very odd size to me. 10x1.25, 11x1.5, or 12x1.25 might be more common threading, and bring the price down.

1.25 is a common thread pitch, they should have the tooling available to make that. maybe it's not common for head studs, i don't know, but in terms of maching and tooling practices the 1.25 pitch shouldn't be the hold up. most threads on the EA82 and other motors are 1.25 pitch. i think will was saying the length was the issue, no existing studs that long. do these motors have the longest head bolts of any motor ever made? i can't imagine they're that strange.

We need to ask ARP if they have any that are longer but all the other specs are the same. If so I was told by my aircraft MT guys that if we can get them longer there will be ABSOLUTLY NO PROBLEM adding threads to the stud and then cutting the access off. This needs to be found out, and Quick!

We need to ask ARP if they have any that are longer but all the other specs are the same. If so I was told by my aircraft MT guys that if we can get them longer there will be ABSOLUTLY NO PROBLEM adding threads to the stud and then cutting the access off. This needs to be found out, and Quick!

 

 

that is EXACTLY what I sent a request to ARP about.

WJM...... Your the BOMB!!!

 

 

And I thought I was the only one thinking like a genius.

HEHE:brow:

 

Just kidding guys your ALL cool like US! :cool:

 

 

DONT FORGET TO LET US KNOW WHAT THEY SAY!!!!

I am very interested in this deal. Alothough for 3 sets it was only like $350 a set, that isnt so bad really. I know lots of people who run arp studs and they paid way more than that.

 

I ma subscribing. I want to know. I mean if you got a copper HG, studs, and maybe counter bored the block with a steel o-ring, these engines could handle probably 30-40 psi of boost....until the heads crack, of the bottom end pretzles.

 

I know its apples to oranges, but I have friend with a cummins dodge engine who had the copper gasket, counterbore, and studs done. He is hitting 115 psi of boost, no problems.

Postted for the subscription. I forgot to do it last post.

30-40psi? ha these things could hold that stock try 80+ :-p

A set of studs for EVO an EJ engines run $100 and $175....so $350 is WAY too much.

 

$260 should be our price for ARP studs for EA82.