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  1. 8

    L29 454 MPFI Spider Conversion Questions

    If you're in there to do injectors you might as well do the regulator too. Sent from my XT1254 using Tapatalk
  2. 8

    Catalytic Converter

    I don't have to be a lawyer to know that removing cats is illegal under federal law. In the US local laws don't matter on that front, a state could make a law that says it's ok to remove cats, but it would be superceded by the federal law that says it isn't. And as I stated before, the feds...
  3. 8

    Catalytic Converter

    Same. One of these days the epa is going to start cracking down on people that removed their cats. Think they're expensive now? Wait until a bunch of people who removed them have to replace them to be able to register their vehicle. Plus a modern high flow cat really doesn't sap that much power...
  4. 8

    Front Half Fuel Line Replacement

    Huh, I didn't realize those were factory on my 88, I just figured someone had replaced the hard lines at some point in time. I had to replace them though since the fittings were shot. Sent from my XT1254 using Tapatalk
  5. 8

    Front Half Fuel Line Replacement

    Check inline tube. They probably have them or can make them if it's not in their catalog. Plus they offer them in stainless for like $20 more Sent from my XT1254 using Tapatalk
  6. 8

    "Hidden" oil galley plug question

    Found the video I was thinking of. GM borrowed the head chambers from the LT1 to make the vortec heads, maybe they decided to borrow that too. Or possibly someone else has already been into your motor & did it. Skip to 15:25, I tried posting the direct link to the time, but the forum stripped...
  7. 8

    "Hidden" oil galley plug question

    I'll have to see if I can find it again, but I was watching one of karl ellwein's videos on the lt1 & it had something like that. Sent from my XT1254 using Tapatalk
  8. 8

    Big 3 cable upgrade crashes into ohm's law

    I've seen a few people that have done it, but iirc it's pretty involved on these trucks, they had to trim the core support to get the depth they needed for the projector assembly. Sent from my XT1254 using Tapatalk
  9. 8

    Big 3 cable upgrade crashes into ohm's law

    Friend of mine is a toyota tech in farm country. He told us about a prius that came in for wire replacement 3 times because rodents kept eating them. They finally told the owner to surround the car with mousetraps. Here's the one I use. Pulled from a camaro service manual. Sent from my XT1254...
  10. 8

    1988 k1500 summit stock replacement headers

    I put the ceramic coated version on my 88. Haven't had time to hook the exhaust up, but it's close enough that it won't be an issue. I'm going to a 3 wire sensor, but that was planned long before the headers, I actually bought the sensor & pigtail in 2013, they've just been sitting on a shelf...
  11. 8

    The Official Vortec 454 Info thread

    Iirc anything after 89 will have the proper rubber for ethanol. Sent from my XT1254 using Tapatalk
  12. 8

    Big block headers

    Gmt400 454 tbi headers fit right in, but you have to fab something up for the egr if you're not going to eliminate it. Sent from my XT1254 using Tapatalk
  13. 8

    97 5.7 Vortec Temp/Coolant Sensor/sending Unit Clarifications...?

    The sensor on the intake is for the pcm, the one in the head feeds the gauge as you thought. It wasn't until the gmt800s that the pcm fed the temp info to the cluster. It would require a tune, but that pcm does have the ability to run an electric fan as there was an optional auxiliary fan...
  14. 8

    1994 Suburban 1500, 8 volts at fuel pump

    I ended up upgrading both of my trucks with racetronix hotwire kits when replacing the pumps & tanks to avoid this. They don't make a direct fit, but I got one for another application (I'm thinking it was a gnx, but I'd have to look for the invoice) with the same pinout & same shape plug, I just...
  15. 8

    1994 Suburban 1500, 8 volts at fuel pump

    They tend to dislike being undervolted like that, so that may have contributed to it. Or it might've just been a bad pump, wouldn't be the first time that's happened. Personally I'd play dumb about the wiring & try to get it replaced under warranty. Sent from my XT1254 using Tapatalk
  16. 8

    1994 Suburban 1500, 8 volts at fuel pump

    If you're only getting 8v at the connector I would suspect a wiring issue, probably corrosion somewhere between the relay & the tank. Sent from my XT1254 using Tapatalk
  17. 8

    Which Spark plugs and gap for 96 L29 454??

    For gap go with .045 instead of the called for .060. I don't have the link handy, but one of the rv companies tested it on a chassis dyno & it was worth a few whp. Plus smoother idle Sent from my XT1254 using Tapatalk
  18. 8

    Question on Rear O2 and Catalytic Converters

    My 97 454 had one hollow cat & one functional cat. It never threw a code on the stock PCM & it was like that for who knows how long. According to Justin @ blackbear that was normal on the 1 tons. Sent from my XT1254 using Tapatalk
  19. 8

    96-00 L29 454 Headers

    Found the last thread on it: https://www.gmt400.com/threads/what-headers-for-7-4.43471/
  20. 8

    96-00 L29 454 Headers

    There's a post on it somewhere. IIRC the difference is the EGR tube, the 95-down headers work, but you have to adapt the EGR tube to them.
  21. 8

    Ethanol vs Non-Ethanol Gas

    Pretty much all gas that's available here is 10-15% ethanol, neither my '88 tbi 350 or my '97 454 seem to be bothered at all by it. IMO e85 is only worth it on higher compression motors that need 91+ octane. The price difference between e85 & 87 octane isn't worth the mileage loss. But I'll...
  22. 8

    454 upgrades - help

    Gm pn 12561462 for the injectors. 28# instead of the oe 19# & they plug right in. Both of the sets I have ran me around $100 Sent from my XT1254 using Tapatalk
  23. 8

    Belt tensioner

    Shouldn't be any adjustment to it. That bolt just gets tightened to spec when installing, all the adjustment is handled by the internal spring automatically.
  24. 8

    Questions on Misfire for 98 Burb with 7.4l

    The injectors on these motors are notorious for leaking, so I would be suspecting them for the fuel smell. At the least I would replace them with the yellow tops from 5-0 motorsports or consider upgrading to slightly bigger ones. One of these days I'll remember to find the injector chart someone...
  25. 8

    K2500 crew cab...

    I'm going to be lazy & just link to a post I've already made regarding mods/issues: https://www.gmt400.com/index.php?posts/1084556 As far as towing ability, I have yet to get mine to even struggle pulling a load. Only thing I wish is that I had a ec or cc instead of a rc. Sent from my XT1254...

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