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  1. 8T7K5

    L29 Coil near plug questions

    As soon as my engine is back from the machine shop I'm planning on tackling the 0411 swap and coil near plug on my 99 big block. I've got a set of L21 valve covers and without having the engine to mock it up, it looks like (from pictures) the bottom of the resonator is going to interfere with...
  2. 8T7K5

    L29 CNP conversion

    While the engine is out of my K2500 Suburban getting ready to be rebuilt I've been thinking about doing a coil near plug conversion. I know the L21 came with CNP from the factory and I've managed to find a set of L21 valve covers. I know nothing about wiring and in order to do this I'd need to...
  3. 8T7K5

    Vortec big block questions

    I've been working on my 99 K2500 Suburban off and on for about a year now. When I bought it, the previous owner had broken a starter bolt in the block. That screwed up the flexplate. Since that needed to be replaced, the starter bolt needed to be drilled out and retapped/helicoiled, the oil pan...
  4. 8T7K5

    L29 removal questions

    So I've been working on my 99 K2500 for a few months off and on, mainly off since winter hit and I can only work outside. I had been tracking down a miss, pulled the injectors and tested them, all of which seem to be working and firing fine. Before all of this happened the starter had been...
  5. 8T7K5

    Flexplate replacement

    While my Suburban is out of commission over some fuel injector issues I'm also going to replace the flexplate. Got quoted over 500 bills for a shop to do this and even though I've never done it, it doesn't seem too difficult and I'd like to save those Benjamins. The plan is to support the...
  6. 8T7K5

    99 Vortec 454 injector harness

    I'm replacing a broken injector connector on my 99 big block and found what looks like corrosion on the wires, pretty sure that's not some kind of insulation. Assuming it's like that through the whole harness, especially given how old and brittle/stiff the wires feel, could that corrosion cause...
  7. 8T7K5

    Chasing down a miss

    I've asked this in another thread, looking for a little more specific info if possible. My 99 Vortec big block has an intermittent miss on #4 and constant miss on #3. Injectors are new Bosch, regulator is new, distributor, cap, rotor, plugs, wires are all new. Upper/lower intake gaskets are new...
  8. 8T7K5

    Aftermarket EFI on Vortec 454

    I'll probably catch some negative feedback for this line of thinking, but here goes..As the title says I'm considering ditching the factory dual intake/mutli port FI system for an aftermarket FI system. Yes, I know: It's probably not as efficient as the factory system; it probably doesn't make...
  9. 8T7K5

    Vortec 454/no start after new distributor

    This weekend I was busy replacing the injectors in my 99 K2500 Suburban. Before putting on the upper intake I hand rotated the engine to TDC for #1, pulled the #1 plug and verified with a camera that it was at tdc. Put the distributor back in, got everything else put back on and nothing. It...
  10. 8T7K5

    Intake torque specs/Vortec Big Block

    So I'm about to be putting in new injectors in my 99 K2500 Suburban. I've been looking at Alldata for my truck and it's showing two different torque specs for the upper intake. According to a TSB issued on 5/96, it says this: "A revised torque sequence, torque values and use of a threadlocker...
  11. 8T7K5

    Cam installation Vortec 454

    I'll be reinstalling the cam on my Vortec big block tomorrow and I'm trying to figure out how to "sync" the cam and crank. I know the engine needs to be rotated to #1 tdc but after that, I've reached the limits of my mechanical know-how. Once the engine is at tdc for #1, how do I position the...
  12. 8T7K5

    Rocker arm torque Vortec 454

    Using my handy (but not so effective) endoscope I discovered that the cam gear on my big block was worn. Once I finally got the cam pulled out I found that it isn't worn after all and is in pretty good condition. I did find two lifters with stuck plungers so they'll be replaced. I'm curious...
  13. 8T7K5

    Cam/lifter/pushrods Gen VI 454

    So I've been working on my 96 K2500 Suburban for a year now off and on. One thing has led to another with the engine..it was missing, got that fixed then noticed the engine was wobbling. Found out the crank pulley was out of round where it goes on the crank snout. The balancer was in equally bad...
  14. 8T7K5

    Stuck balancer

    So I've been working on my 96 K2500 Suburban since last summer. I've focused on the engine first and it's came a long way from not starting to where it is now. After tracking down a miss and fixing it I noticed that the engine shook a lot when idling. It looked to me like the crank pulley was...
  15. 8T7K5

    Leaking freeze plug?

    Crawled up under my truck today (96 K2500 Suburban/454) just looking. Found what looks to be like a leaking freeze plug where the block heater goes in. It's the freeze plug right above the starter. If it is leaking can it be fixed without yanking the engine? I swear..I fix one thing and 5 more...
  16. 8T7K5

    Hard start Vortec big block

    So I've fought with my 96 K2500 Suburban for a while now trying to figure out the rough idle/miss. Finally changed the ignition coil and ignition control module as well as the IAC. Now it idles at about 600-700 rpm and it idles smooth, no more miss. It's still starting a little hard though...
  17. 8T7K5

    Vortec 454 idling problem

    I posted a while back about issues I was having with my Vortec 454 and the upper intake. Finally got that lined out, put a new gasket on without rtv and it sealed up fine. I also changed the fuel pump and filter and fuel pressure regulator. Now it's doing something new. When it starts it idles...
  18. 8T7K5

    Vortec 454 vacuum leak/rough idle

    I'm gonna say first off I'm not a mechanic but I'm able to follow instructions and willing to learn. I've got a 96 K2500 Suburban I recently bought as a project. It had been sitting for at least 6 months maybe longer. Engine had a miss so I changed plugs cap rotor and plugs. After doing that, it...
  19. 8T7K5

    94 Suburban K2500 TPS issues

    I recently got a 94 K2500 Suburban with a big block that had been sitting for a while. Changed plugs, wires, cap, and rotor and it's still got a rough idle, rough acceleration and hard shifts into drive/reverse as well as high idle (about 1100-1200). After doing some research I figured I'd...
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