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    Honestly I would go an 8.1. I have one in my 99...

    Honestly I would go an 8.1. I have one in my 99 Tahoe and one in my 83 G20. Both are from Express/Savanna vans.
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    My Express van is actually under the knife this...

    My Express van is actually under the knife this summer so to speak. I hurt the L31s short block. Its getting something ALOT more powerful, lol. Going to have to really get it dialed in well...
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    IIRC those never vans only had one shroud part...

    IIRC those never vans only had one shroud part number for both the 18" and 19.5" HD cooling fans. Even if you have the 18" fan you can measure the shroud and its likely a 21" opening. Would give...
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    The white wire off your coil connector that is...

    The white wire off your coil connector that is not connected to anything is a standard 8 cylinder tach output.....Just pointing it out.
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    I would honestly try a Vortec GMT400 11 blade...

    I would honestly try a Vortec GMT400 11 blade composite tow package fan blade before upgrading the clutch. Those came on like a 98 Tahoe. Those 5 blade steel jobs do not pull nearly as much air even...
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    Mine progressively lost power as it heat soaked....

    Mine progressively lost power as it heat soaked. First pull was 204 and the 3rd pull 198.

    The Express van took a huge hit after the first pull. 2nd pull was aborted because of an accidental...
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    Good to see you are starting to get somewhere. ...

    Good to see you are starting to get somewhere. Torque is finally starting to reach where I feel it should be.

    My guess is the stock manifolds just have a strangle hold on your engine. As I said...
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    Well by that logic HPT is a copy of SCT. I have...

    Well by that logic HPT is a copy of SCT. I have both softwares. I was running my 06 Ram that I swapped from a 4.7 to a 5.7 on the 4.7 PCM I SCT tuned way back in 2010.
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    Where you in 2nd gear when this was happening? ...

    Where you in 2nd gear when this was happening? Just want to point out you can make the 4L60E lock the converter in 2nd gear like the older 700r4s through the programming.
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    1995 G30 cutaway van school bus engine.

    1995 G30 cutaway van school bus engine.
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    Nope I have played with some that had the 30 psi...

    Nope I have played with some that had the 30 psi system. Used the weird TBI with the governor on the side.
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    Not all V6s or small block V8s used the low...

    Not all V6s or small block V8s used the low pressure system. The later model vans and some trucks with the speed governed TBI units built like the 2 ton truck 366/427 TBI units also had high pressure...
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    96-02 5.7 Express van. I have 2 on mine. Bank 2...

    96-02 5.7 Express van. I have 2 on mine. Bank 2 sensitivity mirrored to Bank 1. Aka values for Cylinder 2 copied into 1, 4 into 3, etc.
  14. TCC is the shift light pin on aa manual. You...

    TCC is the shift light pin on aa manual. You would use the non computerized automatic option rather than manual.
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    I had almost that same combo in my G20 Van years...

    I had almost that same combo in my G20 Van years ago. I had a LT4 cam with 1.6 rockers. It was a tire smoker even with 3.08 gears.

    You will enjoy the 8.1. I have one in my 99 Tahoe with a 4L80E...
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    Anything with a 7.4 and the 7427 used a 46 lb/hr...

    Anything with a 7.4 and the 7427 used a 46 lb/hr injector @ 28 psi. Barely enough fuel to support a stock 5.7 Vortec much less anything making any power at all.

    I use 14.1 stoich on our E10 here....
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    I use the PE adder to add 4-6 up top. Actually...

    I use the PE adder to add 4-6 up top. Actually starts adding 1-2 as low as 2,600 when its in PE. I have found situations where you will be at high Kpa for a while and not need the fuel enrichment....
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    I will look for you. I think I may have a 1999...

    I will look for you. I think I may have a 1999 or 2000 G2500/G3500 5.7/4L80E file. From what I remember those two years use the same operating system. I used the 4L80E van file to segment swap a...
  19. I am not sure on the limp stuff for all the...

    I am not sure on the limp stuff for all the modules, never have tested a TBI one just going off what another found. I just know that the marine engines had a nice ramp when they advanced and assumed...
  20. When you are looking at an OEM junkyard module...

    When you are looking at an OEM junkyard module the 369 and 048 will clearly be stamped on top. Many fullsize G-vans got the 369 module in either a 4.3 or 350 V8. A lot of the TPI cars had the 369...
  21. They actually have advance built into them in...

    They actually have advance built into them in limp home mode. Alot of GM based carbureted marine engines use the TBI distributor and module in bypass mode. Alot of GM based carbureted marine...
  22. Thread: 94 Silverado

    by Fast355
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    Maximum knock retard at that RPM when not in PE...

    Maximum knock retard at that RPM when not in PE perhaps? Possibly not real knock.
  23. I am scratching my head here as to how you are...

    I am scratching my head here as to how you are having a seal to lock clearance issue??? The locks sit above the lowest point of the retainer. What retainers were you running?
  24. Every set of stock vortecs I have messed with...

    Every set of stock vortecs I have messed with have had .490 to .510" clearance in OEM form after the seal was fully seated. Most are actually .510" clearance. With the 787 retainers it gave me...
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    Its a known issue with that dataloging software. ...

    Its a known issue with that dataloging software. That glitch happens when the timing advance goes Negative.
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