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Old 12-29-2012, 12:41 AM   #1
jacky599r
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Default My builder asked me to ditch the ARPs, opinions?

Hi,

My engine is being built as we speak. My builder suggested that i stick with the stock head studs over ARPs. Does the stock head studs serve well if i am planning for a dom2.5 twinscroll with methanol? I've seen people having problems with ARPs but they seem to be the benchmark and necessity for engine rebuilds. Any qualms using back the OEM ones?

J
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Old 12-29-2012, 01:29 AM   #2
Stonejedi
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If it was me I would use the uprated arp bolts but if your builder is recommending the use of the O.E bolts and is in the processs of building your engine that's his decision. Is it going to be a build back to standard?
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Old 12-29-2012, 01:32 AM   #3
jacky599r
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Nah, what i am having now is:

PnP heads
Wiseco 100mms
Manley H beams
ACL
11mm oil pump
Killer B pickup
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Old 12-29-2012, 02:28 AM   #4
Strider327
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ARP head studs are way better than oem. If your builder is suggesting OEM, you should go somewhere else. They have been proven over and over again to be good. I honestly can't say I've ever heard of anyone using OEM head bolts for a build.
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Old 12-29-2012, 03:13 AM   #5
ckyguy68
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Did he explain WHY he suggested them? I'm curious to hear.
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Old 12-29-2012, 07:17 AM   #6
Stonejedi
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Quote:
Originally Posted by jacky599r View Post
Nah, what i am having now is:

PnP heads
Wiseco 100mms
Manley H beams
ACL
11mm oil pump
Killer B pickup
I would definitely be using the arp bolts as has been said query said builder and ask him why the O.E bolts is his preference over uprated arp bolts.
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Old 12-29-2012, 11:18 AM   #7
jkopinga
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ARP headstuds FTW!
You can just get the "normal" ARP headstuds and no need to go L19 or CA625+ material.
If you have ever been plagued with Head Gaskets leaking you will know it's a royal PITA and adding a set of ARP headstuds isn't gonna break the bank.

Jasper.
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Old 12-29-2012, 12:50 PM   #8
Bamofo
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Use whatever he suggests just make sure you hone the cylinders for whatever your going to use :-) ive used both and they all work when used properly. Nothing wrong with the stock bolts either.
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Old 12-30-2012, 12:22 AM   #9
stretchedk7
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^^^^ yes!! the stock head bolts are better than standard arps in my opinion. You know if you do the oem tq specifications on a standard arp it wil twist and break every time! as in tq on them isnt nearly what is is on the stockers. granted the oem are stretch bolts.

either way i have used the stock headbolts many times over 500 pump gas whp with no issues.
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Old 12-30-2012, 12:47 AM   #10
jacky599r
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He was saying something about the torque process being less then a hassles and for my power goals, stock ones are more then enough...
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Old 12-30-2012, 03:22 AM   #11
scoobasaurusrex
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Either or will work fine. Personally, if you trust your builder (which I'm assuming you do given that you went to them in the first place), then let them use the parts that they think will work best given your application.
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Old 12-30-2012, 08:11 AM   #12
stretchedk7
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Quote:
Originally Posted by jacky599r View Post
He was saying something about the torque process being less then a hassles and for my power goals, stock ones are more then enough...
he could have been talking about how the arps and others need to be retorqued again after they are heat cycled. not that you have to do that.

if you trust him go for it on the stock hb's.
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Old 12-30-2012, 12:02 PM   #13
Irv Weissmanhowerton
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hasn't there been some problem with one of their batches? maybe he heard about some failures with the problem having to do with arp, so he is avoiding possible problems
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Old 12-30-2012, 12:32 PM   #14
k mier
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Quote:
Originally Posted by Irv Weissmanhowerton View Post
hasn't there been some problem with one of their batches? maybe he heard about some failures with the problem having to do with arp, so he is avoiding possible problems

Ohhhhhhhh!!! Don't you even go there, I just ordered a set of ARP headbolts. Now I've got something else to worry about.
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Old 12-30-2012, 01:01 PM   #15
kakarot09
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Stock bolts will probably be fine but I like ARP better. Some people have mentioned the arp's yielding when you use the stock torque pattern but its a lot different. The stock torque pattern has friction along more than double the length of the threads and uses oil for lube instead of the arp lube. Pretty hard to say that's a fair comparison.
Also the regular arp studs have a yield strength of 190000 psi while a grade 10.9 metric bolt has a minimum yield strength of 130,000 psi. Unlikely that the head bolts are much stronger than that.
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Old 12-30-2012, 01:07 PM   #16
kakarot09
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Quote:
Originally Posted by k mier View Post
Ohhhhhhhh!!! Don't you even go there, I just ordered a set of ARP headbolts. Now I've got something else to worry about.
Don't even worry. Arp makes some of the best bolts you can buy. Have you seen anywhere where someone has proven the arp studs were a problem? I've seen speculation occasionally but I've also seen that the more likely culprit is the cometic head gaskets or potentially not a fine enough surface finish for the gasket and not an issue with the studs themselves. I had a head gasket fail with stock bolts on my stage 2 Sti a few years ago. The 08 Sti I have now has eaten coolant since I bought it also. I used arp studs on my last Sti when i fixed the head gasket problem and its still running fine 3 years later.
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Old 12-30-2012, 03:01 PM   #17
stretchedk7
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stock and arp are good. even for high hp levels if things are built right. good ra finish, true surfaces. CORRECT tuning!!
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Old 12-30-2012, 05:06 PM   #18
spoolinsti05
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^Yup. Subaru doesn't re check the tq that's why they tell you to do it like that in the manual. You think they really are gonna sit and wait for a gasket to settle on the assembly line? Common sense my friends. It applies to many situations.
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