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  1. Bextreme04

    Pretty sure I blew a head gasket this morning....

    Make sure to test the cap and the radiator separately. Make sure to test the engine side with it filled up with water. Attempting to pressure test an empty cooling system is a bomb waiting to happen.
  2. Bextreme04

    Pretty sure I blew a head gasket this morning....

    My first thought is that you should make sure you didn't lose a hose somewhere. All of your symptoms could have been from an air bubble in it from when you filled it back up or a blown/loose coolant line somewhere. If it had just gotten up to temp and the system pressurized for the first time...
  3. Bextreme04

    Modified engine crewcab gas mileage?

    You have to run more timing on a lean mixture because the combustion happens slower in extreme lean conditions. You could actually be hurting the engine and not getting the real benefit of lean cruise in the 15-16AFR range. A lean mixture does have significantly higher EGT's than a stoich...
  4. Bextreme04

    LS regasket question

    Yeah, I'm not buying new front and rear plates for no reason. 99% of the time you are replacing old gaskets and reusing the old covers. If you DID buy new covers and they came with gaskets pre-installed, I would personally try to just push the seals out without damaging them and then properly...
  5. Bextreme04

    Modified engine crewcab gas mileage?

    You would need a dyno and pretty precise equipment to create one, but it is doable. I bet GM has the curves for all of their engines, especially the newer fuel injected ones. For fuel Injected engines I think you could get pretty close to accurate numbers using the logging function in HP tuners...
  6. Bextreme04

    LS regasket question

    I have the mr. gasket crank seal tool and a different front tool I ordered. I just made a flat bar to bolt on for the oil pan. I suggested that tool set because it was cheap. If you already have all the other parts I would just make a flat bar you can bolt across the surface, because trying to...
  7. Bextreme04

    Vortec Head Timing With Progression Ignition

    maybe start with a base timing map from an L31 truck/suv/express van from 96-2005?
  8. Bextreme04

    LS regasket question

    Just save yourself the trouble and buy the tool set. They are like $20 on amazon. You should have a front, rear, and pan tool. Bolt the pan tool on the back and then slide the rear tool over the crank, it will center the cover on the crank and let you push it down flat against the pan rail tool...
  9. Bextreme04

    1980 C10 Cruise Control Switch 407437

    Yeah, I have the rostra retrofit stalk and two relays converting the signals to the correct input for the GMT400 module. It only needs the 4 commands from the stalk and a VSS signal to function. Finding the correct cable to run from the module to whatever carb/EFI setup you have will be the...
  10. Bextreme04

    Modified engine crewcab gas mileage?

    I'd avoid the ProFlo... I've heard nothing but bad things about their computer and the programming ability of it. Probably cheaper and easier to put a holley BBC manifold on it and run factory P01 or P59 ECU. You should be able to get a throttle body, pedal, wiring harness, and computer for dirt...
  11. Bextreme04

    1991 Suburban 3/4 ton: TBI to Holley Sniper conversion - stupid, or worth it?

    What are you looking to get from this? None of this will be simple or a bolt on, and in the end you will still be left with a fairly tired TBI 350. If everything drives fine but you want a bit more pep, you could probably just do a mild RV cam and slightly better heads when you do the head...
  12. Bextreme04

    Modified engine crewcab gas mileage?

    4l80 will just bolt up to the T-case if the T-case is already behind an '85-later TH400. They use the same round bolt pattern after 85. You will want to get a 4wd 4L80 and get the adapter that was on the 4l80 at the same time. Honestly, most people just get a decent junkyard 4L80 that doesn't...
  13. Bextreme04

    Modified engine crewcab gas mileage?

    People choose not to believe it because it isn't true. You don't get better MPG with all of that added, in fact you usually get worst MPG. You might CALCULATE a higher MPG because you didn't account for how wrong your odometer is now that you changed your gear ratio and tire size though. I can...
  14. Bextreme04

    Lost Two Gen 3 LS Engines in my 1986 C10 2WD

    LS injectors ARE bosch injectors. For most years volvo, GM, Ford, etc.. all used the same or similar Bosch injectors. The main issue you see with injectors is from junkyards or from aftermarket suppliers of higher flowing injectors for performance applications.
  15. Bextreme04

    Modified engine crewcab gas mileage?

    There is a set amount of torque required to keep the vehicle at a constant speed. HP is the amount of torque being applied over a distance(RPM). HP means nothing in this case. There is a curve in the engine where BSFC(Brake specific fuel consumption) is best, this means that there is an RPM and...
  16. Bextreme04

    Lost Two Gen 3 LS Engines in my 1986 C10 2WD

    No one is suggesting that LS motors have all kinds of problems. We are all suggesting that when using a used engine, it is prudent to do 5 minutes of diagnostic data collection before you just slap it into a truck and drive it around. I would never try to start an engine that I didn't know how...
  17. Bextreme04

    Modified engine crewcab gas mileage?

    It's possible... occasionally, but not probably. 15-20 is pretty normal for a fuel injected 1/2-ton blazer/tahoe/suburban if you are in an area where freeway driving stays below 70mph. This kind of thing is pretty regularly said on GMT400 forums too, then once people start asking questions and...
  18. Bextreme04

    Modified engine crewcab gas mileage?

    I have 35's, 4.10's, 350/TH400/NP205. I get around 10mpg. I'm swapping to a fuel injected 454/4L80. If it was me and I had a already round pattern TH400 truck, I'd be looking really hard at a 4wd 4L80 and 4.56 gears with the 35's. The 4.10 gears will be perfect for the 454, but that 383 is gonna...
  19. Bextreme04

    Lost Two Gen 3 LS Engines in my 1986 C10 2WD

    I'm just going to point out that 130psi on a 2002 5.3 is not OK compression. That should be 150-185psi AT LEAST. You need to verify everything. Run compression on all cylinders. When you go to get a new motor, run compression test on all cylinders BEFORE you try to run it in the truck. You...
  20. Bextreme04

    HIT THE IGN. KEY AND NOTHING

    I had similar issues with my truck and it turned out to be a worn button inside the starter solenoid. Do you get a click when you turn the key to start, but it won't turn the engine over? Does the lights and gauges come alive but you don't even get a click? Does nothing happen at all? Be more...
  21. Bextreme04

    Intake Manifold RTV Dry Times

    I believe the instructions say apply the sealer, then immediately set the other part in place and allow to set up for ~15-30 minutes(read the instructions yourself because my memory sucks). Then torque to spec. It basically evens everything out and adheres to the two parts evenly when you set it...
  22. Bextreme04

    Intake Manifold RTV Dry Times

    I was going to suggest the same thing as edelbrock. Right stuff will be ready to use in 90 minutes. Use the same process as you have for regular RTV, but it will be fully cured and ready to go same day.
  23. Bextreme04

    Missing sway bar bolts. Anyone know what size they are?

    Stock setup: https://www.lmctruck.com/suspension/suspension-front-rear/cc-1973-87-front-sway-bar-components-4wd?srsltid=AfmBOoqbyY_eH_KVA7z3McJ3CTTGeylq3mfy4CyM5C0n4rgrWz4TQt8- If you have at least a 2" lift, I highly recommend the ORD disconnect kit. It really unbinds the front swaybar and...
  24. Bextreme04

    Where are you tapping into for ACC power?

    They are different styles of ATO(also called PICO) fuse taps. American autowire sells a kit with all the various flavors for ~$25 depending on the source. Here's the kit on summit...
  25. Bextreme04

    backfire under wide open throttle

    You should also look at the condition of your damper. If the damper slipped and you just set timing before this issue started happening, you might have set your timing to a completely nonsense value. You can verify the mechanical TDC of the engine with a piston stop tool pretty easily and they...

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