OE are Torque-To-Yield type bolts. They stretch as you tighten them (by design) to guarantee a certain level of clamping force. They are a one time use only fastener. To achieve higher clamping pressures, in an attempt to mitigate having fewer fasteners to begin with, studs are installed because they are A) re-usable for the guys that like to play inside their engines, and B) can take an awful lot of torque with far less risk to the threads in the engine block.
Yep, the 6.0L only has 4 head bolts per cylinder, IIRC the 7.3L had 6 bolts per cylinder. With increased cylinder pressures the cylinder heads want to lift off the block, good fasteners offer more clamping force which will help keep the cylinder head on the block. The SBF suffers a similar fate when you add cylinder pressure to them in stock form due to only 4 head bolts per cylinder. Of course when you get silly with them you just split the blocks in half due to their other weaknesses.
I sold Ford cars and trucks for six years then all heavy duty stuff for another year… the worst part of the job was dealing with a pizz poor service department that wouldn't honor our warranty… good luck and I'm glad they helped you as they should have...
Glad to hear they made it right They might not have even known the extent of the problems -- wouldn't be the first time someone traded in a truck when they realized they were facing expensive repairs (after resetting the check engine light.)
AND the most awesome reason to put studs on a diesel are so you can raise the boost pressure! If anything ever has to be done to my truck where the engine is already apart that far I will have my mechanic put studs in just so I can twin turbo it. I would love to have twins on it! Thats my biggest complaint is I can't push enough air through to keep it cool if I have my programmer jacked up.
They may be but it's pretty awesome to hear them whistle at 70 to 100 psi! This is video of the one of the only diesel mechanics I would let touch my Cummins. My truck goes to him for everything it needs and the prices are incredible. He is a good old boy in the in WV and the only thing he works on is Cummins. This is his daily driver that he calls his grocery getter Here is his old pulling truck Listen to this thing spool up at 150 psi
I sure dislike stacks on a pick up truck! I wish someone would explain the fascination with them. They're pick up trucks not semi trucks, I'm not willing to give up bed space for the silly looking things. What ever floats your boat I guess!
I don't really like them on a daily driver truck and would never have them on mine but with those pulling trucks they need enough of a pipe to push some serious airflow. The one guy near me has a 10" single pipe and it would be pretty hard to run that under your truck.
A friend of mine builds diesels for pulling trucks. 150 PSI is the norm. They have a dragster too. The bottom end is basically a 5.9 Cummins reinforced with concrete. The top end is top secret.
I completely understand needing them on a pulling set up, my grip is more towards the daily driver crowd. For me it's right up there with getting a "smoke" tune on purpose.
Yeah it gets on my nerves to! Nothing worse than some punk fogging you out at a red light. The cops around here have started writing tickets for doing it and greatly reduced the amount of it going on thank goodness.
Kinda like having a brand new extended cab or crew can shortbed diesel pickup as your daily driver. All that power and it can't even take a sheet of plywood with the tailgate closed. Granted its a sharp looking truck but if all your looking to haul is a** I can think of more effective ways to spend that 60k+.
My neighbor has a GMC Canyon with a 6" stove pipe sticking up out of the bed??? I hope he lost a bet.
Lol, I've thought about doing the exhaust on mine but a 6" stove pipe stack is not exactly what I had in mind.....
Well about 100 miles since the fix and on the way back from lunch I launched it up onto the interstate pretty hard well as hard as the stock truck will run and next thing I know I have a CEL light on code is insufficient egr flow so I pulled the egr valve cleaned it reinstalled pulled the battery cables to clear the cel and have ran it hard for about 20 miles so far without a cel coming back on. Will have her put some more miles on it tomorrow and hope for the best buddy said it could also be a dirty MAF sensor.