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04-23-2017, 07:55 PM
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#1
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Name: winkdemon
Title: Fast, Cheap or Reliable.
Status: Not Here
Join Date: Oct 2009
Location: calgary Alberta
Member`s Gallery
Posts: 248
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limits of 425 headstuds
I have done lots of head gaskets on 6.7's never had a problem with 425's ( on a stock ish truck) but have had couple guys in the last year blow gasket again with 425's. so just wondering what you guys have for experience on the issue. I have 625's in myself but its a hard to get some people to send the extra money.
Thanks 
__________________
1995 cummins 2500 DD stock 
1991 cummins race truck still to slow
2003 cummins 3500 tow pig 6.7 powered
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04-25-2017, 08:24 PM
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#2
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Name: TBittner
Title: Too Much Time
Status: Not Here
Join Date: Mar 2010
Location: Irwin, PA
Member`s Gallery
Posts: 462
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I have a buddy with 425s and had atleast one maybe two failures(can't remember now), only running a programmer/fully deleted and is a pavement princess
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04-26-2017, 09:52 AM
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#3
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Name: khales
Title: Diesel Enthusiast
Status: Not Here
Join Date: Nov 2010
Location: utah
Member`s Gallery
Posts: 172
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most issues ive seen have been on deleted truck with stock turbos
__________________
94 sclb 2500 prostock/ss 6.7 12v puller Gonebroke
07.5 sclb 6.7 gt55 175%injectors dual cp3 fun truck
07.5 mcsb 6.7 deleted 391k miles wife’s truck
14 cclb 6.7 68rfe 2500 dd tow rig
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04-26-2017, 10:54 AM
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#4
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Name: BRE
Title: Too Much Time
Status: Not Here
Join Date: May 2010
Location: Southwest MO
Member`s Gallery
Posts: 12,705
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Quote:
Originally Posted by khales
most issues ive seen have been on deleted truck with stock turbos
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This. Tuning plays a huge roll with the stock turbos. A lot of tunes have the drive pressure through the roof.
__________________
Rick
07 Dodge 3500 - Tow mirrors, silencer ring MIA, Spectra air filter.
Quote:
Originally Posted by jfaulkner
There really is nothing better than OEM. That goes for anything from turbos to boobs.
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RIP Dex KCCO
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04-26-2017, 03:01 PM
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#5
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Name: Justappumped24v
Title: Too Much Time
Status: Not Here
Join Date: Feb 2016
Location: Illinois
Member`s Gallery
Posts: 1,311
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How tight are you torquing them? I run ARP 2000s (425) to 155 ft Lbs never had a failure or had a broken stud, I run 625s to 185 ft Lbs
__________________
05 QCSB24v HTD 6.8L, DDP fueling PDD shifted
2011 MCSB 6.7, built 68rfe
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04-27-2017, 12:43 PM
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#6
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Name: CorneliusRox
Title: Seasoned Rookie
Status: Not Here
Join Date: Dec 2012
Location: Detroit, MI
Member`s Gallery
Posts: 4,154
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Quote:
Originally Posted by Justappumped24v
How tight are you torquing them? I run ARP 2000s (425) to 155 ft Lbs never had a failure or had a broken stud, I run 625s to 185 ft Lbs
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Holy ****! Are you sure your torque wrench is accurate? I've never seen 12mm 425's take 155 ft lbs, and I have seen a couple break at ~135.
And 185 on the 625's. Has anyone pulled the threads out of the block getting up that high? I could see you getting close to that.
__________________
Corey - BSME '21 Tesla Model 3 Perf
'22 DMax AT4 2500
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04-27-2017, 12:55 PM
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#7
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Name: TheHammer
Title: broke
Status: Not Here
Join Date: May 2012
Location: juneau wi
Member`s Gallery
Posts: 738
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Quote:
Originally Posted by CorneliusRox
Holy ****! Are you sure your torque wrench is accurate? I've never seen 12mm 425's take 155 ft lbs, and I have seen a couple break at ~135.
And 185 on the 625's. Has anyone pulled the threads out of the block getting up that high? I could see you getting close to that.
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^^seen the same. i get leary putting them at 130. depends on the truck and what its going to be used for seen alot of 425s fail on cr. but i've also seen 425s handle well over 100psi with a s475 being the small charger in the compounds, but thats a mechanical engine. bottom line, i do not recommend 425s on cr, if the goal is adequate hp.
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04-27-2017, 09:52 PM
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#8
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Name: cummin get it
Title: coal train
Status: Not Here
Join Date: Sep 2009
Location: Beaver lake Nebraska
Member`s Gallery
Posts: 1,267
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I just torqued my 425's to 150 for my engine the other month. No issues.
__________________
Leo
01 3.0 pull. Home of scrap iron.
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04-27-2017, 10:27 PM
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#9
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Name: diesel_importer
Title: Too Much Time
Status: Not Here
Join Date: Oct 2007
Location: Fairfield,TX
Member`s Gallery
Posts: 4,500
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I'm not the best person to chime in, but I will anyway. My personal preference is new Cummins head bolts to ~ 130 ft lbs, unless they'll spend the money to get 625's. I've just heard of way too many CR trucks popping gaskets with 425's.
Sent from my iPhone using Tapatalk
__________________
01 QCSB 2WD AUTO: Redline/Smarty, Monster VP, 6x.013, S467 FMW, Goerend Trans, Caltracs.
Fuel only - 11.85 @ 114, 50 Shot - 11.58 @ 116 w/ 1.69 60'
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04-28-2017, 09:40 AM
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#10
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Name: RHP997
Title: part-time
Status: Not Here
Join Date: Apr 2012
Location: south texas
Member`s Gallery
Posts: 271
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Ive got 425's on my 2011 for 5 years no issues. On my 2001 10.90 truck has 8 year old 425s also that have been reused and torqued countless times. Head is oringed. That engine has seen twins with unknown drive pressure (100psi gauge) now just a single with nitrous. Both sets torqued to the recomended 125 ft lbs
Sent from my SAMSUNG-SM-G890A using Tapatalk
__________________
2016 NHRDA 10.90 champion
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04-28-2017, 12:31 PM
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#11
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Name: nasty 2005
Title: Cummins Tech.
Status: Not Here
Join Date: Apr 2011
Location: S. Minnesota
Member`s Gallery
Posts: 301
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Quote:
Originally Posted by Justappumped24v
How tight are you torquing them? I run ARP 2000s (425) to 155 ft Lbs never had a failure or had a broken stud, I run 625s to 185 ft Lbs
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I have done the same for 15 years with no problems, except I torque the 625's to 175!
__________________
11' CCSB, MCC by Anarchy, AFE, Revmax, Flopro, Applied Performance Products, Caltracs, Leveled, 35's
Sold-95' ECLB
R.I.P-05' QCSB
Last edited by nasty 2005; 04-28-2017 at 12:33 PM.
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04-28-2017, 07:21 PM
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#12
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Name: Pvmt-Pndr
Title: Diesel Enthusiast
Status: Not Here
Join Date: Apr 2015
Location: MI
Member`s Gallery
Posts: 177
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I've been hesitant to tell what I've been getting away with with my 425s. They were in the truck when I bought it. My old turbo I'd hit 42 psi or so with 50+ psi DP. My new turbo I'll hit 53 with unknown back pressure (i haven't checked DP since I swapped to this one). I usually get on it at least a couple times a week and always run in my highest setting with my efi live
__________________
2007.5 Cummins, 4x4, RevMax 850, Locked 4:10s, ATP Tuned, Tater 67/67, AirDog 165, stockish fuel
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05-08-2017, 02:04 PM
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#13
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Name: ctd>therest
Title: Green Behind the Ears
Status: Not Here
Join Date: Jan 2016
Member`s Gallery
Posts: 49
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I go 170 on my 625s no problems here. I put 60psi on my s482 5000rpm no head gasket issues yet. (Knock on wood because sh!t happens haha)
__________________
2011 rclb ctd/4x4/s482/87fmw/300hp-nozzles/Anarchy-tuned/inglewood-manual-48re/ppe-fuelers/625s
2006 cclb 4x4 some goodies 8.48@82.50mph
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