Cracked blocks

Highroller54 · Jun 4, 2013

does anyone have more crack pics to post up?

gman1 · Jun 4, 2013

Highroller54 said:
does anyone have more crack pics to post up?

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Highroller54 · Jun 4, 2013

I knew as soon as I hit reply lol

My buddy owns passenger auto and is interested in a solution but I need some pics for him. He's a badass machinest/welder/fabricator. I'm trying to get a spare block as we speak.

mike@haller's · Jun 4, 2013

BBottoms said:
I was under the impression that this was typically limited to a couple of the studs.

No one is really certain what its limited to yet. I certainly wouldn't try mixing the bolts with studs

Morgan@Midwest Diesel & Auto · Jun 4, 2013

In the cracked blocks I have, all been across the second stud from the ends in the lifter valley. The wall thickness around the stud there is thinner than all the other studs.

Not saying that other studs holes can't crack too. Just my observations. And based off material strength, if the blocks were to have a weak area that breaks when torqued, it wound be one of the four studs next to the lifter valley that have 1/2 as much material around them. So far this has been the case for my shop and quite a few others I have talked to with cracked blocks.

kingranchstroker · Jun 4, 2013

All this talk makes me want to go back to an 07 6.0 with low miles lol but if it seems to be only when your torquing them for the second go around or just goin over spec then maybe ill just keep the bitch! But the whole cracking pistons sucks ass too... Sorry for the rant, carry on with the great info guys

powerstroked08 · Jun 4, 2013

I have ARP's and used the new moly lube. I torqued them to the new spec of 275# and i did that in 5 steps. This was the first time these studs were used and the milage was 66,xxx. Current milage is 77,xxx. So far so good

riest:

Ipkyss · Jun 4, 2013

Whats the torque spec on the factory bolts? My elite studs were torqued to there spec in 2011. 15k later, 71mm lp, mostly towing on the Spartan 250 tune and pulling long hills at 40-42 psi boost. No issues yet, Knock on wood. This thread is the first I have ever heard of this. Hopefully the 190ft lbs is enough to keep my heads holding well and my block in one peice.

If one person was to read all the things that could possibly go wrong with these trucks (or any truck) They would go insane or sell it and start riding a bike to work LOL

Morgan@Midwest Diesel & Auto · Jun 4, 2013

I think the majority of people are just fine. There is only a had full of cracked blocks out there in comparison to all the ones studded and successfully holding their coolant in!

Highroller54 · Jun 4, 2013

Anyone know what the factory head bolt's clamping force is?

webb06 · Jun 4, 2013

Highroller54 said:
Anyone know what the factory head bolt's clamping force is?

Not enough lol for high hp anyway

extreme3807 · Jun 5, 2013

Great, more shiz to worry about now. Just lovely lol

Meniacal_Mark · Jun 5, 2013

I dont know why everyone is worrying. With the amount of cracked blocks mentioned that's only a drop in the bucket as to how many were produced.
*(Even more if the old maxxforce 7 block was the same)

bigrpowr · Jun 5, 2013

Highroller54 said:
Anyone know what the factory head bolt's clamping force is?

no idea what the clamping force is, but it takes more effort to break them free, than it does to final tq on any aftermarket stud.

Highroller54 · Jun 5, 2013

I'm going to try a 72mm on stock bolts and Matt's tunes, see how long they will hold 650 lol

Morgan@Midwest Diesel & Auto · Jun 5, 2013

I've never blown hg on a 6.4 with stock head bolts. Without nitrous anyway. Seen better part of 60 psi of boost on stock bolts too.

sootie · Jun 5, 2013

i did on my old truck with just a mini maxx, 5" straight pipe and K&N intake. the word "abuse" hardly explains it tho
LOL

Breaking Habits · Jun 5, 2013

For what its worth, I've never seen a late model 6.4 blow the gaskets under 650 RWHP. Its always the 08 trucks that do it. The later gasket seems to always prevail

Jared