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  1. S

    99 L29 454 build

    It's only a couple of lifters that are noisy though. The Comp 900 lifters are really cheap, and apparently noisy too. How about a set of their normal hydraulic link bar rollers, like the 854? Yikes, about $600 for a set. https://www.ebay.com/itm/276495299110
  2. S

    99 L29 454 build

    Also I still have a lot of valvetrain noise. I bought a Lisle mechanics stethoscope that really works. I ran it with the left valve cover off, again, and identified the #1 and #5 exhaust rockers as the sources. It's a sharp tinking sound, like holding a pushrod like a drumstick and tapping it on...
  3. S

    99 L29 454 build

    I have sent it up to BB for the tenth and last time. I could have bought HP by now. I can't imagine they don't know how to make a lot of cruise timing drop off fast, so it must mean they are just too lazy to change all the cells.
  4. S

    99 L29 454 build

    L31, does the 8.1L table ramp up timing at low map like we are talking about? Add 15 to 20 deg at cruise? BB said they could go to the 8.1 table but never did.
  5. S

    99 L29 454 build

    Great! What software is that? It went from 41.5 deg at 7% tps and 54.0 map, to 28.5 deg at 100% tps and 94 map. That's the 14-15 deg range I think it needs between low map/ low throttle and high map/wot throttle. So how do you set all those cells? Is BB blowing me off because it's a lot of work?
  6. S

    99 L29 454 build

    Super tht's exactly right, I went from 10.5 to 12 mpg highway when I had them boost the cruise timing from 20-25 to 30-35 deg. It just doesnt drop off enough when it goes into heavier part throttle. L31, how much timing over the wot curve do you add at cruise? I need to drive around with a...
  7. S

    99 L29 454 build

    Well I'm on the 8th or 9th tune and it is still pinging hard at 1800 when towing and moderate 30-40% throttle. I emailed BB a log of the current tune along with a log from the previous tune and I see no difference. Both show 6-7 deg KR at 1800 rpm and 20-40% throttle. Tuner replied and said we...
  8. S

    The Official Vortec 454 Info thread

    Here's another one for $1,350! Insane! https://www.ebay.com/itm/235038151506
  9. S

    The Official Vortec 454 Info thread

    Great info! Thanks I'm not looking for anything in particular, but I would like to find one of those books. They must have heard us talking about it because the price has jumped to $1,002.. https://www.ebay.com/itm/204658024753
  10. S

    The Official Vortec 454 Info thread

    That is rare, there is one on ebay for $960..
  11. S

    The Official Vortec 454 Info thread

    So a long time ago mangonesailor said "I also have a book (some call "THE book") on building/rebuilding the Gen5/6 big blocks. Usually $500 on ebay but I found some used book place online selling it for $25." What book is that? I searched ebay just now for 'rebuild gen 6 chevrolet big block...
  12. S

    99 L29 454 build

    Extreme, the pressure in the manifold is almost always less than ambient. The vacuum level is typically about 15 inches at idle to 24 inches when coasting down. (29 inches is absolute vacuum). The only time manifold pressure approaches atmospheric is at wot when air flows in with minimum...
  13. S

    99 L29 454 build

    Thanks Mang! (See what I did there?) That is so true about the intake. Go back to post 44 of this thread, where I drilled the manifold and put a thermocouple probe into the number 2 cylinder runner. Air going into the head was at the full temperature of the engine, 190+. More throttle didn't...
  14. S

    99 L29 454 build

    Ok thanks. That's great as long as it can do the obvious, which is reduce timing as engine load and cylinder pressure goes up. I trust they will get it right this time. If not, can I send it to you L31? I just thought of something. The egr is turned off in the tune. Could they be forgetting to...
  15. S

    99 L29 454 build

    I'm on something like the 8th trip back up to the tuner. Besides still pinging at wot, it audibly and steadily pings at hway speed 55-65 climbing slight hills, when rolling into the throttle in 3rd and 4th gear, and at 30-40% throttle accelerating through the gears. So I asked them to reduce wot...
  16. S

    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    How's the compression? No sense worrying about injectors if it's not healthy.
  17. S

    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    Ok I see, yes I was trying to say fuel tank pressure sensor, which is what I though OP was asking about.
  18. S

    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    Here is the full page. FPS started in 98. And I don't know if this is relevant to what you were saying.
  19. S

    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    Ok, I am trying to understand. You said this: I posted page from the 98 c/k service manual, showing the ftp circuit on the 7.4L engine, so it has to be a 2500/3500. Edit - I see the top of the page that said 7.4l was cut off, sorry.
  20. S

    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    "Yeah, I'm going to have to go ahead and disagree with ya there..." 1998 c/k factory service manual:
  21. S

    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    Super, I think they started using a fuel pressure sensor starting in 98. It was an option for me to wire in with the 0411 swap.
  22. S

    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    Bex, how long should the stock rail and regulator hold pressure? My Holley aftermarket fpr bleeds down pretty fast, but I don't think it hurts anything, as it goes immediately to full pressure when I hit the key.
  23. S

    Another 454 Vortec Build Thread - Documenting, Q&A, Help

    How bad is the gas? I would siphon it all out.
  24. S

    6.5 to 454 vortec swap

    Isn't the pushbutton 4wd on 1/2 ton only?
  25. S

    6.5 to 454 vortec swap

    You will want to swap in the L29's complete wiring harness and ecm. It's completely different from the throttle body wiring. You should consider doing the 0411 ecm swap too. It's a lot of work, but worth it if you have the time. I found burned wires in a couple places on mine, that I never would...

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