LB7: Head studs vs factory
- Thread starter madmax02
- Start date
Heads can lift slightly even with the stock charger with big tuning (32# boost). Not so much to blow the gasket out, but enough to let some coolant into the cylinder. There was evidence of that when I rebuilt my engine.
Its not the boost on a stock turboed truck that is lifting the head, its the drive pressure. The fact stock studs can hold 80psi+ of drive pressure tells you something right there
I musta had some really bad hg's then. I had evidence of coolant in 6 of the 8 cylinders when i did mine at 118k miles. Just took the heads off a 220k mile 02 lb7 tonight, #4, #8, #7 all had signs of coolant in those an that truck got ragged on HARD!!
Didnt wanna take a chance, went back with studs in mine, got them for $525.....josh is doing studs too. Peace of mind i guess
Didnt wanna take a chance, went back with studs in mine, got them for $525.....josh is doing studs too. Peace of mind i guess
Thats what I have heard from others also. Boost plus aggressive tuning can result in a failure. So why take the chance? I would do head studs . I bought a set years ago that are sitting in the garage for when the day comes. I bought them so long ago I paid $525 for them to my door! seems I could sell them today and make a profit!
the amount of abuse the HG's take really seems to vary from truck to truck. We're at 612rwhp on one customers 02LB7 and she's still running strong yet i see popped HG's on customers trucks that were babied all the time. roll of the dice i say
I saw the same thing when we tore mine down Tom. It had some rust on the deck between 5 & 7 . Coolant would magically disappear every couple months after the 4094 and nozzles too. Never went over 40 psi.
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Ran over 60psi when I had the twins and stock motor rod failed before the HG's did. Had no sign of coolant in any of the cylinders either. Every motor is different. Off you have the coin do them if not then you may want to play it safe with tuning.
come to think of it my truck may be doing this too. i notice my coolant level drops very very slowly. Truck makes 42psi max
I'd like to know the whole seller that sells the studs for $400 not for the studs but for other things! I have a couple accounts with whole sellers and I can get them for just under $550 ,I have seen them cheaper ,under $540 but they probably whack you with shipping handling BS.
I have the accounts for Jeep parts ,tires ETC easy enough to set up a account since I have a business with all the necessary docs required to do it. So if anyone finds out or if Paint wants to give it up drop me a dime in a PM. Not looking to go into business just personal purchases.
I have the accounts for Jeep parts ,tires ETC easy enough to set up a account since I have a business with all the necessary docs required to do it. So if anyone finds out or if Paint wants to give it up drop me a dime in a PM. Not looking to go into business just personal purchases.
I ran a big single and stock studs. No problem. I was about 46lbs boost on the big tune. Truck had 160k on it when I sold it. Truck was tuned since 8k miles at varying levels Have a couple friends with 05lly's under 100k miles that have had HG issues with 40-60 hp tunes probably only 25-30lbs boost.
If i could buy them for $400 i could mark them up, resell them and still come in under my cost now lol. hook us up with your source,,,:thumb:
My 01 needed HG's, I did ARP's and C grade gaskets, seems like 01-02 are more prone to have HG issues, I was running a Toman tune that got my old LB7 down the track in 12.65 seconds with a stock turbo (34 psi) and stock injectors/Cp3.
Prolly stupid but I'm guessing over tightening of the stock bolts won't get you any more "clamp" than stock spec? The Dodge guys do it with success but I don't know if we could?
More so you could sell them to whole sellers by way of a drop shipment never even touch them in quantity just some paper work and make a ton of money at $400 !!! ME TOO on the source! :thumb:
If you or anyone else finds out who is selling them for that cheap, I want a PM too.
No. They are torque-to-yeild. The yeild strength of the bolt is engineered to be the specific clamping force the engine designers figured would be required. That is why they are tightened as a torque plus aditional degrees. Speeds up the assembly line process...
so how is it the cummins guys are getting away with more torque on their TTY bolts and holding headgaskets together better than at the factory torque?
