Head Bolt Stretch

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Sep 6, 2008 | 12:46 AM

kawa

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Joined: Jun 2007

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From: Rogue River, OR

Head Bolt Stretch

I just went to the FTE 6.0 forum as my neighbor is having a problem with his 2004 6.0. After I posted some question I just surfed around an really ended up on a horror thread re Head Bolts Stretching. It seem that "TTY" bolts stretch and in doing so loosen the heads thusly blowing head gaskets. Altho they never said so it appears that these TTY bolts are stock issue.

The recommended solution are "ARP" Studs, these puppies also stretch but return to their original form.(They can really do that?)

Now my question, altho I have never seen it addressed: Are the OBD/PSD head bolts susceptible to this type of catastrophic failure ??

Rog

Sep 6, 2008 | 08:31 AM

tjbeggs

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Joined: Apr 2004

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From: Silver Lake Dunes, MI

The 6.0 have the issue cause they have less head bolts than the 7.3. They only have 4 per cylinder and I think we have 6. Studs are stronger so they don't stretch. The only time the heads lifting will be an issue is in boost situations higher than 40 psi. Even then you might be ok for a while.

Sep 6, 2008 | 10:17 AM

Talyn

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Joined: Oct 2003

Posts: 17,791

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From: Ashland City, TN

Yea, all metal expands and moves in some shape or form. Sometimes just in micron's.

Just like spring steel being able to bend and return, or memory steel (glasses.)

When metals get hot or cold they can move a bit, so I can easily see a bolt stretching and when cooling returning to size.