Head stud vs. Head bolt clamping force - Competition Diesel.Com

tmacie · 02-04-2007, 02:16 AM

I searched a bit but didn't come up with anything.

What is the difference in clamp force on stock head bolts and replacement head studs?

Travis

Billyram · 02-04-2007, 08:56 AM

I can't give you #s but the stock bolts have course threads and are carbon steel good for 80-90 ft lbs. Over that they just keep stretching.
The ARP studs have fine thread nuts and washers lubed with moly and can be torqued to 125 ft lbs. They seem to stop stretching at arround 90-100 ft lbs.
The clamping force has to be more than double.

inline6359 · 02-04-2007, 09:21 PM

I also dont have any numbers but there is a saying for them.

Head bolts are an accountants design and head studs are an engineers.

tmacie · 02-05-2007, 09:50 AM

Thanks for the info guys. If anyone has data to post, that would be sweet.

Travis

snow ram · 02-16-2007, 11:21 AM

i hate sending people to other web sites, but DonM put a little bit of time into this test, its a pretty good read
http://www.dieseltruckresource.com/d...ad+stud+torque

tmacie · 02-16-2007, 12:10 PM

good info, thanks!!!

*Bobcat698* · 02-16-2007, 08:50 PM

I talked to a customer of mine that had the stock bolts and the ARP bolts sent in for analysis and the results showed the ARP's didn't have much advantage over the stock bolts..
Just posting what I heard though, I didn't see the actual numbers.

McRat · 02-16-2007, 08:55 PM

Not that I'm against head studs, matter of fact the new engine will have them.

But with an aluminum head Dmax, I've ran the crap outta of the truck with the stock headbolts and gaskets and no leaks (59PSI, 755rwhp). I'm not sure holding down the head any tighter is going to make it go faster.

If you are planning on running big boost or nitrous, buy the insurance. If you are staying under 50 PSI and no bottle, I think the money would be better spent elsewhere. My amigo Tim runs about 60 PSI and nitrous in a 24v and last I heard he had stock bolts.

*THATpreston* · 02-16-2007, 10:02 PM

I know a 12 valve running well in excess of 60 pounds of boost (WELL in excess) that has factory head bolts and runs an 8.7x 1/4 mile.

We will now wait for Mr Hogue to tell us what a tragic error we are making ......

snow ram · 02-16-2007, 11:25 PM

i would rather spend the couple hundred bucks for studs then the amount of downtime and and head aches of taking a risk with stock head bolts.....
for the last however many years, engine builders (gas and diesel alike) couldnt be wrong if a stock bolt holds just as good as a precision made stud (that needs to be about an 1/8 inch shorter)

02-04-2007, 02:16 AM	#1
tmacie Name: tmacie Title: Geen but Sooty Status: Not Here Join Date: Oct 2006 Location: VT Member`s Gallery Posts: 403	Head stud vs. Head bolt clamping force I searched a bit but didn't come up with anything. What is the difference in clamp force on stock head bolts and replacement head studs? Travis __________________ 2005 2500 quad cab, stock but not for long. SOLD - 1994 Ram 2500 CTD Reg cab, auto, 200k mi., EGT, trans and boost spying tools, 5" mitre cut stacks, Mystery switch, 100 plate a hair back from FF, 16.5 deg. timing, BHAF 3kgsk!!.

02-04-2007, 08:56 AM	#2
Billyram Name: Billyram Title: Too Much Time Status: Not Here Join Date: Jan 2007 Location: N.Augusta,SC Member`s Gallery Posts: 607	I can't give you #s but the stock bolts have course threads and are carbon steel good for 80-90 ft lbs. Over that they just keep stretching. The ARP studs have fine thread nuts and washers lubed with moly and can be torqued to 125 ft lbs. They seem to stop stretching at arround 90-100 ft lbs. The clamping force has to be more than double. __________________ Billy 04.5 Blue Ram Garmon built tranny SunCoast ProLoc II Dragonflows Wicked's Dragonslayer Smarty

02-04-2007, 09:21 PM	#3
inline6359 Name: inline6359 Title: Microwaving cats since 01 Status: Not Here Join Date: Aug 2006 Location: Western PA Member`s Gallery Posts: 2,043	I also dont have any numbers but there is a saying for them. Head bolts are an accountants design and head studs are an engineers. __________________ "If at first, the idea is not absurd, then there is no hope for it"-Einstein

02-05-2007, 09:50 AM	#4
tmacie Name: tmacie Title: Geen but Sooty Status: Not Here Join Date: Oct 2006 Location: VT Member`s Gallery Posts: 403	Thanks for the info guys. If anyone has data to post, that would be sweet. Travis __________________ 2005 2500 quad cab, stock but not for long. SOLD - 1994 Ram 2500 CTD Reg cab, auto, 200k mi., EGT, trans and boost spying tools, 5" mitre cut stacks, Mystery switch, 100 plate a hair back from FF, 16.5 deg. timing, BHAF 3kgsk!!.

02-16-2007, 11:21 AM	#5
snow ram Name: snow ram Title: Newb Status: Not Here Join Date: Nov 2006 Location: Sioux Falls, SD Member`s Gallery Posts: 141	i hate sending people to other web sites, but DonM put a little bit of time into this test, its a pretty good read http://www.dieseltruckresource.com/d...ad+stud+torque __________________ i wish i had something smart to put here

02-16-2007, 12:10 PM	#6
tmacie Name: tmacie Title: Geen but Sooty Status: Not Here Join Date: Oct 2006 Location: VT Member`s Gallery Posts: 403	good info, thanks!!! __________________ 2005 2500 quad cab, stock but not for long. SOLD - 1994 Ram 2500 CTD Reg cab, auto, 200k mi., EGT, trans and boost spying tools, 5" mitre cut stacks, Mystery switch, 100 plate a hair back from FF, 16.5 deg. timing, BHAF 3kgsk!!.

02-16-2007, 08:50 PM	#7
Bobcat698 Name: Bobcat698 Title: Pure Diesel Power Status: Not Here Join Date: Apr 2006 Location: Marshfield, WI Member`s Gallery Posts: 2,229	I talked to a customer of mine that had the stock bolts and the ARP bolts sent in for analysis and the results showed the ARP's didn't have much advantage over the stock bolts.. Just posting what I heard though, I didn't see the actual numbers. __________________ Pure Diesel Power 715-254-1833

02-16-2007, 08:55 PM	#8
McRat Name: McRat Title: Too Much Time Status: Not Here Join Date: Apr 2006 Member`s Gallery Posts: 1,571	Not that I'm against head studs, matter of fact the new engine will have them. But with an aluminum head Dmax, I've ran the crap outta of the truck with the stock headbolts and gaskets and no leaks (59PSI, 755rwhp). I'm not sure holding down the head any tighter is going to make it go faster. If you are planning on running big boost or nitrous, buy the insurance. If you are staying under 50 PSI and no bottle, I think the money would be better spent elsewhere. My amigo Tim runs about 60 PSI and nitrous in a 24v and last I heard he had stock bolts. __________________ Pat McSwain 2007 Kodiak Duramax "Home Base" 2006 GMC 2500HD "Wendy" 12.50@107.44 Tuning+MikeL Trans. 2005 GMC 2500HD "Casper" 197mph+ clocked at Bville. 10.59@130. SuperStreet 3.0 Sledpull winner. Same truck. 2004 GMC 3500 "Big Blue" 13.10@103. Sledpull Winner.

02-16-2007, 10:02 PM	#9
THATpreston Name: THATpreston Title: Brush your teeth. Status: Not Here Join Date: Apr 2006 Location: In a van down by the river... Member`s Gallery Posts: 5,179	I know a 12 valve running well in excess of 60 pounds of boost (WELL in excess) that has factory head bolts and runs an 8.7x 1/4 mile. We will now wait for Mr Hogue to tell us what a tragic error we are making ...... __________________ http://www.keatingmachine.com 2006 Dodge Mega Cab Dually - "MOBYDK" Diesel Performance Converters ~ Pro Street Diesel ~ MCN Diesel CompD Mod White Dodge Club, member #1.

02-16-2007, 11:25 PM	#10
snow ram Name: snow ram Title: Newb Status: Not Here Join Date: Nov 2006 Location: Sioux Falls, SD Member`s Gallery Posts: 141	i would rather spend the couple hundred bucks for studs then the amount of downtime and and head aches of taking a risk with stock head bolts..... for the last however many years, engine builders (gas and diesel alike) couldnt be wrong if a stock bolt holds just as good as a precision made stud (that needs to be about an 1/8 inch shorter) __________________ i wish i had something smart to put here