Engine/Transmission (1998.5 - 2002) Another head gasket???????????

[KKunz]

How much boost can a stock head gasket take when using head studs?

 

[blacksheepdiesel]

KKunz,

About 3 psi less than what it blows at!

Seriously, I have heard of a sled pulling truck that the head has never been off of that runs 80 psi. The head bolts are re-torqued on a regular basis.

Godspeed,
Trent

 

[16919]

KKunz,

About 3 psi less than what it blows at!

Seriously, I have heard of a sled pulling truck that the head has never been off of that runs 80 psi. The head bolts are re-torqued on a regular basis.

Godspeed,
Trent

I have heard the same thing as well... but most agree that over 50 is pushing it on stock head bolts with studs I would think around 70ish maybe a little more. Thats just me... .

 

[GDMRTN]

I blew mine making max of 47psi. It was stock gasket with studs. I'd say 50 or so, depending on your setup. Here again, just going by what i've experienced!!

 

[Cummins724]

I think it all just comes down to retorques. If you retorque the gasket every 1000 miles... . you can run 70psi. If you do it every 3000miles... . about 50psi. Just my $. 02

 

[KKunz]

If you re-torque the studs every 1000 mile how many time do you have to re-torque them before you don’t have to do them any more?

 

[KKunz]

Let’s just say the stock gasket with head bolt is good for 50 lbs of boost, if I’m running 1:1 drive pressure then the head gasket should hold? What is a bigger factor in head gasket integrity boost or drive pressure, or are they equally important?

 

[DCreed]

no difference,boost x compression=cylinder pressure. question should be "what do i have to do to keep it together without weekly retorques or breaking the bank/excessive down time?"

 

[MamthTorq]

Let’s just say the stock gasket with head bolt is good for 50 lbs of boost, if I’m running 1:1 drive pressure then the head gasket should hold? What is a bigger factor in head gasket integrity boost or drive pressure, or are they equally important?

If your drive pressure ratio is 1:1 then they are equal factors, if not 1:1, then drive pressure is more important.

 

[KKunz]

Thanks for the replies it all make sense. As far as the head stud retorque go what intervals do you do them at? Do you eventually not have retorque them or is it some thing that must be done for the life of the engine?

 

[TSBrown]

Thanks for the replies it all make sense. As far as the head stud retorque go what intervals do you do them at? Do you eventually not have retorque them or is it some thing that must be done for the life of the engine?

I'm looking for the same answers. Arp says to cycle the studs 5 times at 125#'s then no other torquing needs to be done to set the stretch on the stud . So what im getting from that is that after 5 cycles the stretch is set on the studs. So if I keep torquing them does thst mean the stud are still stretching or is the HG compressing. And if it is the stud stretching how long before we need to put new studs in and start all over. :{



Tim

 

[bigdaddydieseldan]

From what I have heard getting anywhere near 50 lbs of boost you are playing with fire .

 

[V-Metalworx]

If I read this right you have a 2004. 5 don't they have a MLS style head gasket stock I think they will take more than a 2nd gin gasket but I do agree with everyone rule of thumb has always been 50to55psi I would think if you want to run more than that you need to think abought doing other mods.