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  1. 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...
  2. 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...
  3. 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...
  4. 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.
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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.
  13. 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...
  14. 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...
  15. 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...
  16. Bextreme04

    backfire under wide open throttle

    Backfiring is going to be timing related or a mechanical issue 99% of the time. How did you set your timing? Have you run a compression test on your engine? Intake valves not sealing all the way could cause a backfire into the intake under heavy loads.
  17. Bextreme04

    14bolt FF size vs 10bolt

    Yes, the 14BFF yoke is(I think) about 2-3" longer than a 10 bolt one. You will want to check driveline angles also before you bolt everything together.
  18. Bextreme04

    Questions about... My rear end?

    Depending on where you got the replacements, they likely haven't been rotating in many years... maybe even decades. So the fact you don't see them leaking means nothing. They are almost guaranteed to START leaking as soon as you start driving around on them regularly. Hub seals for a 14BFF are...
  19. Bextreme04

    Tq converter for 5.3 ls swap in a 700r4

    There is no way this will be cheaper unless you already have all the parts. You can get full motors for ~$500 around here.. throttle body to flex plate. You can get an entire engine/trans/wiring harness/ecm for $1000-2500 depending on miles and condition. Standalone harness for an LS and...
  20. Bextreme04

    Twitchy steering with a big travel trailer (rear sway bar help?)

    That should be fine for what you are doing here. A bumper pull trailer on a weight distribution hitch will be adding about 1000lbs max to the vehicle weight. My guess would be that you have not properly set up your hitch and trailer and that is causing the front to be unloaded and twitchy while...
  21. Bextreme04

    5.7 Vortec and TBI

    Operating range is idle to 5500RPM.... You don't want dual plane for fuel injected. You get horrible cylinder imbalance and they have a hard time running right with dual plane manifolds. You can look at a bunch of dyno testing including specific side by side testing that engine masters did...
  22. Bextreme04

    Eaton MLocker

    Its stupid simple. It's just a lunchbox locker like a detroit is, I would probably hate it on a daily, but for my truck it works just fine. Supposedly it makes a big racket with a manual transmission too, but since I have a TH400, that hasn't been an issue either. I'm sure I'll eventually want...
  23. Bextreme04

    Leaking Metal Fuel Line??

    If it was a hole in the feed line, you wouldn't be able to pump any gas... it would just be sucking air. It is most likely either the weep hole in the bottom of the pump or a leak in the return line. There are two rubber lines from the frame rail to the pump and two more from the metal line to...
  24. Bextreme04

    5.7 Vortec and TBI

    The best solution is to just use the chevrolet performance intake manifold... but it isn't cheap. https://www.summitracing.com/parts/nal-12496821?seid=srese1&gclid=Cj0KCQjwqIm_BhDnARIsAKBYcmv2X8lLrqpVk9IIMRSM5Svs4lUHN4QpfI83WOrYfhDJK_ZynW4hP_caAgxBEALw_wcB Pay attention to the note on the...
  25. Bextreme04

    What's this dohicky

    There isn't an opening into the booster unless the diaphragm is busted. If it did leak out the back of the master it will be stuck back there until you remove the master and then it will all pour out. Make sure you spray it all clean with brake cleaner before you bolt the new one back on. If...

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