How are the upgraded ford head bolts? - Ford Powerstroke Diesel Forum
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post #1 of 18 Old 10-29-2012, 08:59 AM Thread Starter
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How are the upgraded ford head bolts?

I'm looking at a truck and it has had new gaskets and head bolts. The dealer installed their new designed ones. Are they still prone to leak like the original ones? Egr was done too.
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post #2 of 18 Old 10-29-2012, 09:06 AM
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If They are still torque to yeld bolts, meaning they are desined to stretch when installed and will continue to do so over their lifetime. Even the arp studs stretch when installed (most engine builders prefer to measure stretch not torque on rod bolts) but the difference is studs only stretch a small amount and stop tty bolts keep going.
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post #3 of 18 Old 10-29-2012, 09:15 AM
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Theres nothing updated about em. Same junk different day

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post #4 of 18 Old 10-29-2012, 09:30 AM Thread Starter
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Thanks guys. I avoid that truck...
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post #5 of 18 Old 10-29-2012, 09:32 AM
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TTY bolts don't "keep going" the torsional force that is inherent with using such a fastener is what weakens it. Have you ever seen a broken torsion bar, they break in a twisting motion.

Excessive ECTs and coolant in the cylinder from a ruptured EGR cooler are more likely reasons to blow a head gasket. While studs will help if you run extended/higher boost, they are not a guarantee of ultimate head sealing.

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post #6 of 18 Old 10-29-2012, 09:32 AM
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unless by updated bolts the dealer means that it has ARP studs in it.

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post #7 of 18 Old 10-29-2012, 10:32 AM
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Quote:
Originally Posted by Karls03 View Post
TTY bolts don't "keep going" the torsional force that is inherent with using such a fastener is what weakens it. Have you ever seen a broken torsion bar, they break in a twisting motion.

Excessive ECTs and coolant in the cylinder from a ruptured EGR cooler are more likely reasons to blow a head gasket. While studs will help if you run extended/higher boost, they are not a guarantee of ultimate head sealing.
So your saying when a 6.0 lifts the heads and blows the gasket, it breaks all the head bolts in half?

It may not be the technical term....but I'm going to say if it gets longer without breaking, it's stretched.
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post #8 of 18 Old 10-29-2012, 10:47 AM
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No, what I am saying is the torsional load on a TTY bolt, or any bolt, is why it is inferior to a stud.

When I do finally push an HG I will most definitely stud it, but I have already taken the steps to keep my head gaskets in tact: EGR cooler delete, new oil cooler, coolant filter, staying off loud pedal below operating temps.

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post #9 of 18 Old 10-29-2012, 11:24 AM
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What they said, the gaskets themselves are not very thick and the bolts even when torqued still have some give. AS everything heats up and expands, the bolts do as well and being different material than the block and heads they expand differently as well, there is a certain amount of leeway for everything to still work together. Arp's have the crap torqued out of them and just smash everything together not allowing(under normal circumstances) things to swell apart as much.

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post #10 of 18 Old 10-29-2012, 11:47 AM
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I have about 70k miles 0n these bolts (I think that the bolts are the same, the torque spec, procedure may be different), running 100-120hp tunes without trouble. I think tat these bolts are fine if the oil cooler/ egr cooler never fail and leak liquid coolant in to the intake.
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