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L19 and getting proper stretch

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9 T GSX

15+ Year Contributor
169
18
Jan 19, 2008
St.Pete, Florida
I have been reading up on this step and have found numerous information on it but none really say how you do it, just that you need to have the proper stretch for the bolt.
Moving on:
Im about to torque down my head with L19's and a Mitsu MLS using ARP ultra torque, Though I'm curious how you get the proper stud stretch.
Meaning do you put a old head gasket on then torque the studs down in 3 steps (ex:30,60,90) Then repeat 2 more times, then remove head put new head gasket on and torque in stages to desired final torque?
2) Do you just put the new gasket on and torque in 3 stages to final torque for 1 time?
3) Do you use no gasket and torque the studs down as above then put new gasket on etc?
If using the new gasket first my concern is that once the compression ring is compressed on the first torque pass once I loosen the studs up for the next 2 pass it will not compress enough to seal?

In case anyone wants a read click on installation tab: http://www.arp-bolts.com/p/technical.php
 
Didn't they come with instructions? I know for reg arp's you torque to a certain spec then back off then again in 3 steps. Then after one heat cycle you check torque again. I've always done mine this way and havnt had a single issue. I have l19's for my next build just havnt used them yet. :)
 
You are making it far more complicated than it needs to be. The stretching is typically for rod bolts using a stretch gauge.

Install your studs with moly lube to 90 in OEM sequence starting at 30, 60, then 90.

After the first heat cycle, check them again and click them back to 90. I usually check them after the first few heat cycles as well.

Done.
 
http://www.arp-bolts.com/p/FAQ.php
Time and time again, ARP does not print that you need to retorque the headstuds/nuts. One can argue whether or not you should, but the company says no...it's not like they made them or anything.
 
We build race engine and use arp alot in a vast verity of engine v8 mostly but 4g63 is one I have done a few times . But the idea of the bolt strech is an engineer aspect. Most engine shops dont even have a bolt stretch guage it only stretches a few tenths if your lucky (one thenth = .0001) theirs nothing you could don't make it excatly right. It's their to make ppl doubt them selves. My father's motor with aluminum rods that revs tob11,000 rpm we torque once and leave it their.they stretch in a bolt is so minute and small the it wouldn't make much of a differance. Not one you will ever see. Maybe in top fuel which that I even doubt they worrie about. And as far as retorquing heads unless you making 1200 hp it's not gonna make a differance to you the only reason that's even done is when boost or in reality the cylinder pressure is so great it pushes the head from the block a few tenths (.0001) of an inch after so many times it is only suggested to retorted them. In any case taken it as you will. Your jus going to confuse your self and be worried over nothing. And it's info that's out their you just have to look most from experience. We have been in business and building motors for over 30 yrs I think we would have run into any problem by now if any of that was a thing to actually worrie about.. good luck either way.
 
Forgot to mention in order to check actual bolt stretch the bolt/stud must be torqued which would be impossible with head studs and I believe l19 has provisions to bottom out the stud against the block which to measure off of would most likely be very difficult
 
I just got off the phone with ARP. They do not have an installation method for the L19's cause they are technically custom order studs. However, He told me max torque on the 12mm L19's is 130. That does not mean that 130 is the number to torque to. That is MAX. From what i have seen big power guys seem to be going to 100-110 on moly lube.

Can anyone that has used L19's chime in on what they are using for torque values on L19's? I am running 30+psi on a 3582hta.

I was running standard arp and mls gasket and started pushing coolant at 30psi and 17degrees of peak timing(10-11 at peak torque). 120 octane race fuel. A well respected DSM'er suggested i go to L19 and oem composite gasket. So that is what I am going to try.

Appreciate any thoughts on L19 Torque values.

Thanks
 
I run 36-40lbs of boost on my HX40. I installed L19's in my 6 bolt with a MLS Cometic Headgasket at 110/ft lbs. I run 18* of timing up top on E85. I checked the torque again after about 100 miles of easy driving, no high boost until about 500 miles.
 
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