Let's talk aftermarket Head Studs

mtcs · 09-30-2010, 06:15 PM

Hey,
well my block and heads should be on their way back to me in the next few weeks. There are a few loose ends on my build that I want to finalize before I start assembly.

I currently have a set of ARP std head studs in the garage that I was going to originally use on my build, but have decided against it.

A few motors ago, I stapped a std arp in half. Lets just say I wasn't too thrilled with ARP at that point. Apparently, I was told that once in a while there are freak head studs that break. Id really rather have 100% confidence in my studs than hope that they don't fail at high boost.

I have been searching online and have come accross a few aftermarket studs that seem promissing.

Rigoli 14mm head studs ($650 new. Pretty damn expensive. But is it worth it?)
P&L 13mm head studs
ARP L19 head studs
Cosworth 11mm head studs

Anyone have good/bad luck with any of these?
Anyone else make oversized studs for the subaru besides the ones in the list above?

* Registered users of the site do not see these ads.

dap · 09-30-2010, 06:33 PM

Quote:

Originally Posted by mtcs

Hey,
well my block and heads should be on their way back to me in the next few weeks. There are a few loose ends on my build that I want to finalize before I start assembly.

I currently have a set of ARP std head studs in the garage that I was going to originally use on my build, but have decided against it.

A few motors ago, I stapped a std arp in half. Lets just say I wasn't too thrilled with ARP at that point. Apparently, I was told that once in a while there are freak head studs that break. Id really rather have 100% confidence in my studs than hope that they don't fail at high boost.

I have been searching online and have come accross a few aftermarket studs that seem promissing.

Rigoli 14mm head studs ($650 new. Pretty damn expensive. But is it worth it?)
P&L 13mm head studs
ARP L19 head studs
Cosworth 11mm head studs

Anyone have good/bad luck with any of these?
Anyone else make oversized studs for the subaru besides the ones in the list above?

Staying with the stock size have you thought about ARP 625+ aged? Were your previous ones ARP2000's?

berdugo · 09-30-2010, 07:32 PM

Roger Clark has 14mm head studs

http://www.rogerclarkmotorsport.co.u...?productID=158

john 1badSTI · 09-30-2010, 07:55 PM

unless you expect to see 40+ psi I would go with arp L19's,14mm require lots of work on the block and heads,I don't know if its the same for p&l 13 mm also.

mtcs · 09-30-2010, 11:23 PM

I forgot about Roger Clark head studs...

The block just came back from darton and hasn't been assembled yet. So I don't think it should be too bad tapping the block for the studs. I know the P&L kit comes two taps. One for starting and one for the bottoming. the head on the other hand might be a little trickier but I rather be safe than sorry.

amalgrover · 09-30-2010, 11:40 PM

you know, i had a ppg 1st gear break on me just outside of break-in and ZERO launches (not even slipped launches) when i was only making 340wtq. does this mean that i should never trust a ppg gearset, do you think it means that either there was a build quality issue in just that particular set, or maybe it was an install issue when the gears were installed in the case? my point is that ARP is correct in stating that sometimes there are freak things that happen when manufacturing things in large quantities (and sometimes even small quantities). sometimes things just break when they shouldn't. i see it all the time on aircraft engines. we could have a bad part, order a new one, and then find out that the new part is bad right out of the box. does that mean we should find another manufacturer? not necessarily...obviously if it happens more than not, it is a problem, but most the time it is just one of those things that happens.

mtcs · 09-30-2010, 11:49 PM

Quote:

Originally Posted by amalgrover

you know, i had a ppg 1st gear break on me just outside of break-in and ZERO launches (not even slipped launches) when i was only making 340wtq. does this mean that i should never trust a ppg gearset, do you think it means that either there was a build quality issue in just that particular set, or maybe it was an install issue when the gears were installed in the case? my point is that ARP is correct in stating that sometimes there are freak things that happen when manufacturing things in large quantities (and sometimes even small quantities). sometimes things just break when they shouldn't. i see it all the time on aircraft engines. we could have a bad part, order a new one, and then find out that the new part is bad right out of the box. does that mean we should find another manufacturer? not necessarily...obviously if it happens more than not, it is a problem, but most the time it is just one of those things that happens.

I just don't know if the std arp studs are up to the task of keeping the heads on the shortblock when I start raising the boost.

amalgrover · 10-01-2010, 12:01 AM

i haven't had any problems running 28psi with an fpred...14,000miles strong right now...

mtcs · 10-01-2010, 02:01 PM

I forgot about AMR's 9/16 big boy head studs. Thing is though, they are as expensive than the Rigoli 14mm studs...

Also, apparently these don't taper at all.
Any idea if the other brands use a taper or not?

cnstman · 10-12-2010, 01:56 PM

how much boost / hp do the standard arp head studs typically support before head lifting becomes an issue?

hobbesnapoli · 10-12-2010, 02:06 PM

plenty... when's the last time you heard otherwise?

mtcs · 10-12-2010, 02:27 PM

The STD ARPs don't fail too often. The only reason mine failed was because apparently I had one freak stud.

Ive seen cars making over 600wheel and still using the 11mm std stud.

cnstman · 10-12-2010, 02:57 PM

Quote:

Originally Posted by mtcs

The STD ARPs don't fail too often. The only reason mine failed was because apparently I had one freak stud.

Ive seen cars making over 600wheel and still using the 11mm std stud.

That is what I thought.

Prevent · 10-12-2010, 04:45 PM

sometimes **** happens..

i have ARP 2000's

alcoolaid · 10-12-2010, 04:48 PM

Im using the std arp studs as well.

PhatBotti Tuning TKR · 10-12-2010, 05:36 PM

Contact AMR in Mamaroneck, NY. They have some beefy studs they manufacture in house

Junior2JZ · 10-12-2010, 06:44 PM

Get the P&L Kit you will not regret it.. I have used them on the last 5 motors we have built. They work awesome and are a quality arp2000 stud with ARP hardware. They also come with the taps needed install them.
I have them in my own motor and so does OverBoostin. I know they are used in the P&L drag STI, drag GC, Fast Eddies 139mph street car and a few other very fast cars.

Jr

Junior2JZ · 10-12-2010, 06:46 PM

FWIW, I don't think you can run a OEM block dowel with the 14mm kits. If you can you will have to machine them down to nothing to fit the stud through them. I wouldn't feel to great about not having block dowels..

STIV6 · 10-13-2010, 03:45 AM

http://www.possumbourne.co.nz/engine_parts.html

tuspace · 10-13-2010, 07:44 AM

^^^^ PBMS and the other ones I can think of are PMS (Perfourmance - http://www.pms.net.au/ )

mtcs · 10-13-2010, 07:26 PM

Well, im going against my better judgement and am cutting a corner. I don't really want to waste anymore time waiting on machine shops to complete a tap/helicoil or timesert job on an assembled shortblock. If it were just the bare block, then it would be a different story.
So I have decided to go with some 11mm L19 studs. They have clamping of 260,000 so that should be more than enough for my build. I hope...

project_skyline · 10-14-2010, 02:26 AM

I'm wondering if anyone thinks standard ARP's will be good for 45 psi and around 700-800whp? lol

Junior2JZ · 10-14-2010, 09:28 AM

Quote:

Originally Posted by project_skyline

I'm wondering if anyone thinks standard ARP's will be good for 45 psi and around 700-800whp? lol

Yea been there by accident. They held on decent, but it did push water even with orings

Jr

09-30-2010, 06:15 PM	#1
mtcs NASIOC Supporter Member#: 180640 Join Date: May 2008 Chapter/Region: E. Canada Location: Montreal, Canada Vehicle: 2000 FF Drag Impreza 6765,PPG,brakeman,Chute	Let's talk aftermarket Head Studs Hey, well my block and heads should be on their way back to me in the next few weeks. There are a few loose ends on my build that I want to finalize before I start assembly. I currently have a set of ARP std head studs in the garage that I was going to originally use on my build, but have decided against it. A few motors ago, I stapped a std arp in half. Lets just say I wasn't too thrilled with ARP at that point. Apparently, I was told that once in a while there are freak head studs that break. Id really rather have 100% confidence in my studs than hope that they don't fail at high boost. I have been searching online and have come accross a few aftermarket studs that seem promissing. Rigoli 14mm head studs ($650 new. Pretty damn expensive. But is it worth it?) P&L 13mm head studs ARP L19 head studs Cosworth 11mm head studs Anyone have good/bad luck with any of these? Anyone else make oversized studs for the subaru besides the ones in the list above? * Registered users of the site do not see these ads.

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09-30-2010, 11:23 PM	#5
mtcs NASIOC Supporter Member#: 180640 Join Date: May 2008 Chapter/Region: E. Canada Location: Montreal, Canada Vehicle: 2000 FF Drag Impreza 6765,PPG,brakeman,Chute	I forgot about Roger Clark head studs... The block just came back from darton and hasn't been assembled yet. So I don't think it should be too bad tapping the block for the studs. I know the P&L kit comes two taps. One for starting and one for the bottoming. the head on the other hand might be a little trickier but I rather be safe than sorry.

09-30-2010, 11:40 PM	#6
amalgrover Scooby Specialist Member#: 183480 Join Date: Jun 2008 Chapter/Region: South East Location: Valdosta, GA Vehicle: 2011 Audi A3 Quattro 2009 Forester XT	you know, i had a ppg 1st gear break on me just outside of break-in and ZERO launches (not even slipped launches) when i was only making 340wtq. does this mean that i should never trust a ppg gearset, do you think it means that either there was a build quality issue in just that particular set, or maybe it was an install issue when the gears were installed in the case? my point is that ARP is correct in stating that sometimes there are freak things that happen when manufacturing things in large quantities (and sometimes even small quantities). sometimes things just break when they shouldn't. i see it all the time on aircraft engines. we could have a bad part, order a new one, and then find out that the new part is bad right out of the box. does that mean we should find another manufacturer? not necessarily...obviously if it happens more than not, it is a problem, but most the time it is just one of those things that happens.

10-01-2010, 12:01 AM	#8
amalgrover Scooby Specialist Member#: 183480 Join Date: Jun 2008 Chapter/Region: South East Location: Valdosta, GA Vehicle: 2011 Audi A3 Quattro 2009 Forester XT	i haven't had any problems running 28psi with an fpred...14,000miles strong right now...

10-01-2010, 02:01 PM	#9
mtcs NASIOC Supporter Member#: 180640 Join Date: May 2008 Chapter/Region: E. Canada Location: Montreal, Canada Vehicle: 2000 FF Drag Impreza 6765,PPG,brakeman,Chute	I forgot about AMR's 9/16 big boy head studs. Thing is though, they are as expensive than the Rigoli 14mm studs... Also, apparently these don't taper at all. Any idea if the other brands use a taper or not?

10-12-2010, 01:56 PM	#10
cnstman Scooby Specialist Member#: 9548 Join Date: Aug 2001 Chapter/Region: RMIC Location: Colorado Springs Vehicle: 2004 WRX STi PSM, 10.741 @ 126.29	how much boost / hp do the standard arp head studs typically support before head lifting becomes an issue?

10-12-2010, 02:06 PM	#11
hobbesnapoli Scooby Newbie Member#: 221436 Join Date: Aug 2009 Location: PA Vehicle: 02 WRX vf39	plenty... when's the last time you heard otherwise?

10-12-2010, 02:27 PM	#12
mtcs NASIOC Supporter Member#: 180640 Join Date: May 2008 Chapter/Region: E. Canada Location: Montreal, Canada Vehicle: 2000 FF Drag Impreza 6765,PPG,brakeman,Chute	The STD ARPs don't fail too often. The only reason mine failed was because apparently I had one freak stud. Ive seen cars making over 600wheel and still using the 11mm std stud.

10-12-2010, 04:45 PM	#14
Prevent * Banned * Member#: 149114 Join Date: May 2007 Location: I'm too mainstream	sometimes **** happens.. i have ARP 2000's

10-12-2010, 04:48 PM	#15
alcoolaid Scooby Guru Member#: 134949 Join Date: Dec 2006 Chapter/Region: VIC Location: Vancouver, BC Vehicle: '07 SWP STi Twinscroll ViPec Anti-lag	Im using the std arp studs as well.

10-12-2010, 05:36 PM	#16
PhatBotti Tuning TKR NASIOC Vendor Member#: 239659 Join Date: Feb 2010 Chapter/Region: Tri-State Location: Tri-State / California Vehicle: STI Mikey & Phatron Tuning Da Subies	Contact AMR in Mamaroneck, NY. They have some beefy studs they manufacture in house

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Junior2JZ Scooby Guru Member#: 64908 Join Date: Jun 2004 Chapter/Region: Tri-State Location: Tuning 8/9sec Subies @ P&L Vehicle: 10.8 XT+ Real stock turbo record holder 11.4	Get the P&L Kit you will not regret it.. I have used them on the last 5 motors we have built. They work awesome and are a quality arp2000 stud with ARP hardware. They also come with the taps needed install them. I have them in my own motor and so does OverBoostin. I know they are used in the P&L drag STI, drag GC, Fast Eddies 139mph street car and a few other very fast cars. Jr

10-12-2010, 06:46 PM	#18
Junior2JZ Scooby Guru Member#: 64908 Join Date: Jun 2004 Chapter/Region: Tri-State Location: Tuning 8/9sec Subies @ P&L Vehicle: 10.8 XT+ Real stock turbo record holder 11.4	FWIW, I don't think you can run a OEM block dowel with the 14mm kits. If you can you will have to machine them down to nothing to fit the stud through them. I wouldn't feel to great about not having block dowels..

10-13-2010, 03:45 AM	#19
STIV6 Scooby Newbie Member#: 27458 Join Date: Oct 2002 Location: Sydney Vehicle: 2003 STI Blue	http://www.possumbourne.co.nz/engine_parts.html

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tuspace Scooby Newbie Member#: 57959 Join Date: Mar 2004 Chapter/Region: International Location: Australia Vehicle: 1998 GC WRX Red	^^^^ PBMS and the other ones I can think of are PMS (Perfourmance - http://www.pms.net.au/ )

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mtcs NASIOC Supporter Member#: 180640 Join Date: May 2008 Chapter/Region: E. Canada Location: Montreal, Canada Vehicle: 2000 FF Drag Impreza 6765,PPG,brakeman,Chute	Well, im going against my better judgement and am cutting a corner. I don't really want to waste anymore time waiting on machine shops to complete a tap/helicoil or timesert job on an assembled shortblock. If it were just the bare block, then it would be a different story. So I have decided to go with some 11mm L19 studs. They have clamping of 260,000 so that should be more than enough for my build. I hope...

10-14-2010, 02:26 AM	#22
project_skyline Scooby Specialist Member#: 153880 Join Date: Jul 2007 Chapter/Region: RMIC Location: Western Slope, Colorado Vehicle: 03 Evo VIII 2011 STI	I'm wondering if anyone thinks standard ARP's will be good for 45 psi and around 700-800whp? lol