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Forum: 4.3L V6 Engine Tech

Vortech 4300, LU3 & LB4 Motors

  1.   Sticky Threads  

  2. Smile Sticky Thread Sticky: 4.3L Vortec Marine Intake Conversion Helpfull Hints:

    Our Test Mule... 98 GMC 4dr Mega Moose Jimmy 4x4. Hello 4.3L Fans.... If your looking for some information for deciding weather the Marine...

    25 Pages
    1 2 3 ... 25
    • Replies: 366
    • Views: 694,934
    01-18-2022 04:29 PM Go to last post
  3. Sticky Thread Sticky: 4.3L V6 Platforms and Engine Codes

    Thanks to Josh Downey and Wikipedia for the info. The Vortec 4300 is a 90° V6 truck engine, replacing the Chevrolet 250 in light trucks and...

    • Replies: 4
    • Views: 27,979
    06-21-2013 01:42 PM Go to last post
  4.   Normal Threads  

  1. manifold passage

    I have posted this on 3 other forums in the last few days. Out of the literally hundreds of people who've viewed it, only 2 replied. This still...

    • Replies: 0
    • Views: 582
    07-01-2022 07:46 PM Go to last post
  2. Short waterpump on 4.3

    Has anyone done this and if so how did you accomplish it

    • Replies: 0
    • Views: 979
    12-18-2021 03:10 PM Go to last post
  3. 4.3L going into a small import

    Hello everyone. I'm helping a buddy with his 4.3L balance shaft equipped engine refresh. The engine itself came from a 99 Chevy Astro van. He...

    • Replies: 0
    • Views: 2,259
    06-07-2021 07:22 PM Go to last post
  4. Intake Manifold Question Vortec pre-1996

    I have been considering doing away with the stupid spider injector on my L35 V6 in my 194 Bravada and going to a carburetor, and I'm trying to figure...

    • Replies: 1
    • Views: 3,009
    05-19-2021 01:50 AM Go to last post
  5. Engine Light Flashing at Higher RPM's

    Hello and thanks for the add! I am looking for an answer to this question that no one I know seems to be able to answer. In the manual of my 2007...

    • Replies: 0
    • Views: 2,129
    02-25-2021 07:26 AM Go to last post
  6. cams

    anyone know if you can put some performance cams on a 2000 s-10 blazer? if so, where can i find some at?

    • Replies: 11
    • Views: 5,195
    12-01-2020 12:31 PM Go to last post
  7. Temperature sensors on '92 LB4

    I've been trying to chase down the cause of rough idle & misfiring on my 1992 S-10 4.3L v6 TBI (LB4) and for a while I was getting a code 15, engine...

    • Replies: 0
    • Views: 19,857
    06-22-2020 08:06 PM Go to last post
  8. Vortec Head Questions.

    I have an older 4.3L (non balanced) with TBI. I have read several post that say the 96+ Vortec head is a good power swap. Should I assume the cam...

    • Replies: 0
    • Views: 2,302
    06-07-2020 11:11 AM Go to last post
  9. Misfire! WHat could cause this?

    I have a 2003 S-10 with a 4.3L EFI engine with a 5 speed, 189,000 miles on it. This morning on the way to work my check engine light started flashing...

    • Replies: 2
    • Views: 83,163
    05-14-2018 10:28 PM Go to last post
  10. 4.3 swap

    Ok I know there several threads in here about twaps but mines a little dif lol . I've got a 93 chevy 1500 4.3 tbi its locked up with a pretty good...

    • Replies: 0
    • Views: 2,896
    05-14-2018 09:51 PM Go to last post
  11. Edelbrock intake differences?

    Hey guys new to forum so please forgive me if this has come up before. I have a '89 Jeep YJ that I swapped a 4.3 out of a '89 s10 into. Part of...

    • Replies: 1
    • Views: 27,886
    04-23-2018 05:21 AM Go to last post
  12. 4.3 Engine Interchanges?

    I am currently running a very tired 1987 4.3 V-6 in my street rod and wish to replace it with a newer 4.3 with lower miles. My question is, what...

    • Replies: 2
    • Views: 3,810
    04-23-2018 05:17 AM Go to last post
  13. Carbureted 4.3L question

    I have a 4.3L engine with an Edelbrock 1403 500cfm carb. My issue is around 3k rpm under load and medium to heavy throttle the engine wants to kick...

    • Replies: 0
    • Views: 2,912
    04-10-2018 07:02 PM Go to last post
  14. Changing dist Cap & Rotor: Modern Vortec 4.3L

    Hello everyone, I just changed my Cap & Rotor. Took a few pics and figured I'd write a little how to. I know, I know, most of you can do this...

    • Replies: 6
    • Views: 83,378
    03-27-2018 09:36 AM Go to last post
  15. Seeking tips, tricks, hacks, experience and knowledge for LU3 service

    Hi, I bought a 1996 4wd Blazer for $800 with a thrown #1 rod and also came with $9K+ or receipts for recent parts and service. Likely a remote oil...

    • Replies: 0
    • Views: 2,753
    03-26-2018 07:13 PM Go to last post
  16. LU3 Fuel System Diagram

    As the title state I am looking for the Upper Manifold fuel system diagram for a 2007 4.3. To give you folks a little background I bought the...

    • Replies: 2
    • Views: 28,986
    08-25-2017 08:02 AM Go to last post
  17. Solid Roller cam in a late 4.3

    My name is Steve, I am new here. I have a Datsun truck 1976 with 4.3 v6 running low 11's. I receintly started building a new 4.3 motor, 1987 (factory...

    • Replies: 0
    • Views: 27,541
    08-05-2017 11:50 AM Go to last post
  18. '96 4.3 Vortec Harmonic Balancer Upgrade

    Building a '96 4.3 running a ProCharger P1sc (now for 30K) and am looking for harmonic balancer/damper options-I want a steel one because of the...

    • Replies: 2
    • Views: 34,390
    05-30-2017 02:16 PM Go to last post
  19. Cam opinions and Questions (legit stuff)

    Ok so I've been over on S10 forum for 12 years this i'm going to copy my thread bc I think the knowledge base is great over here and i'd love to get...

    • Replies: 0
    • Views: 3,299
    05-29-2017 03:04 PM Go to last post
  20. What aftermarket harmonic damper is available for '96 4.3 Vortec OBD2?

    I'm rebuilding my '96 4.3 vortec running Marine manifold, 44#inj, '0411 pcm, intercooled ProCharger P1sc which I have 30,000+mi on combo-80k total...

    • Replies: 1
    • Views: 22,821
    04-08-2017 03:25 PM Go to last post

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