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  1. General Discussions
    Doing head gaskets on my lb7 kinda waiting on my machine work guy to figure if heads check pressure test if they do im looking at buying threaded injector cups gasket kits and 15 over injectors should i be interested in different injectors? Maybe someone give me idea on some good head gaskets...
  2. 11-16 LML Duramax Powertrain
    ‘13 lml with 142,000 miles South central Montana Head gasket replaced 7 months ago by shop. I’ve already been back to them once about this leak, which they blamed on my aftermarket lower coolant pipes leaking and spraying up onto the cylinder head. Slow steady drip of coolant down block and...
  3. New Member Introductions
    New here my first post! But its not my first time using the forum! Thanks guys for all the useful info! Well my truck is in need of some work and the quote is quite a sticker shock! The reputable local shop just quoted me $6739.50 for head gasket replacement not including the gasket and studs...
  4. General Discussions
    I recently bought a 2008 GMC 2500 about 6 months ago. The truck has been performing great and hasn’t caused any issues, but I noticed the upper radiator hose was decently hard after a week of sitting. Could squeeze with one hand about half way collapsed. The truck doesn’t consume coolant, and...
  5. 01-04.5 LB7 Duramax Powertrain
    Issue with LB7 head gaskets. 04 truck. Owned from new. HG replaced 2011 at about 112000 miles. Studs not installed though told they were. injectors done 2014 with Bosch remans. Summer of 2019 at 242000 white smoke, coolant smell out of exhaust. Took it down to block and replaced all...
  6. General Discussions
    I’ve seen a ton of posts on white smoke, but none that fit what my truck is doing. It’s an 05 LLY, EFI live with DSP5 switch, stage 5 tranny, PCV reroute and 10 over injectors. When I have my tune up all the way (position 5) and I get on it it will sometimes blow black smoke, sometimes it’ll be...
  7. 06-07 LBZ & LLY Duramax Powertrain
    Okay, don’t know if this is really the right place for this thread, but i was talking to a buddy today about my lbz and he claimed that the lbz is bad..? he has a 2008 lmm which as far as my knowledge is practically the same engine but with a dpf. and he told me that one of this family members...
  8. 11-16 LML Duramax Powertrain
    Hi all! New member here. I have a 2015 with 415k on it. I’ve had super luck with the truck overall, but alas I figured it had a blown head gasket when I was putting a gallon of coolant in at every fuel stop… I found a diesel performance shop where I live in Ocala, FL. As I suspected they told me...
  9. General Discussions
    I’m new took me 20 mins to find out how to post lol! I’ve got a 2004 lly duramax I just bought I’ve owned for less then 2 weeks! Test drove it twice no issues no leaks other then ac. Me and the lady decided to buy after everything cheeking out drove the beast home an hour away parked it got up...
  10. General Discussions
    I have a 03 Lb7 with 175,000 miles, I had new bosh injectors put in 3,000 miles ago and I'm now experiencing low coolant levels and a hard radiator hose. So, my question is, is it worth is or not to put in the money to do the head gaskets or to sell. My alternative would be to attempt to do...
  11. General Discussions
    I have a 07 chevy lbz with 86k miles on it, and im leaking coolant slowly, i thought it was from heater core adapter coming out of the fire wall but its not, its not the egr because that is fully removed, its not the heater core line and nothing els i can see on top of the engine. I can see...
  12. 911 Problems Forum
    2011 duramax. Egr and fuel filter delete( filter head removed) fass 165 lift pump 3 inch down pipe lb7 up pipe h&s mini max pcv reroute. I just replaced headgaskets and lower oil pan gasket. Cranked over with no glow plugs to try and prime up oil before actually running at idle speeds. Installed...
  13. 01-04.5 LB7 Duramax Powertrain
    I got a 03 Lb7 with 200,000 miles I'm planning on doing a drop in Ryans 64mm turbo in the future, So I'm going to be studing the truck while I do injectors. I know ARP is a very accredited brand, but a set of Xotic head studs are $300 cheaper with very good reviews. Was curious if anyone has...
  14. 911 Problems Forum
    I have a 2005 lly with 107k and it has never been modified or abused. About a year ago I had it push coolant and since then it has had a hard upper radiator hose and it has pushed coolant out a handful of times. It also will run hot randomly and the weather does not effect it. I have not had a...
  15. 06-07 LBZ & LLY Duramax Powertrain
    So my aunt – Temp gauge likes to bounce around and stay at the halfway mark between 160 and 210, and then when I get on The throttle it sometimes jumps back up to right under 210 on the dash temp gauge where are normally used to sit, I have a scan tool that reads life data and regardless what...
  16. 04.5-05 LLY Duramax Powertrain
    So I just finished putting new head gaskets in my 2005 lly. 183k miles and bone stock up until I bought it. When I bought the truck it had typical HG symptoms... black tank, bubbling coolant at cold start with cap off, blowing coolant out when driving etc. So I decided to buy the truck for low...
  17. 01-04.5 LB7 Duramax Powertrain
    Hey all! I have a stock 2001 lb7 3500 dually. It blew a head gasket(!) about 11 months ago or so. I took it apart while leaving the cab on and the turbo on. Unfortunately a few days before I was going to assemble everything while waiting for parts in the mail, I found out I had Lymphoma and it...
  18. 01-04.5 LB7 Duramax Powertrain
    Yes another post but after hours and hours of researching i'm still not entirely sure. My only sign so far is a somewhat stiff upper radiator hose and some pressure in coolant reservoir after a day or so of sitting. Is that normal? Replacing the radiator cap seemed to actually alleviate a lot of...
  19. 11-16 LML Duramax Powertrain
    Hi all; sure hope I'm posting this in the right forum. Please LMK if I should move it elsewhere. First, about the truck: It's a 2015 3500 LT w/ ~295k miles. It has an EFI tow tune and EGR delete (done by previous owner) and a lift pump (done by me), otherwise its stock. Spent its previous...
  20. 2017-19 GM T-K2 Platform Powertrain
    Hello all , I have a 2018 3500hd dually, we use for hauling. truck has 169K miles on it now. have done every possible recommended maintenance on truck since new in 2018! followed everything per GM ! Recently about 3,000 miles ago had to replace turbo due to veins sticking! after turbo was done...
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