FSC - Chevy Truck Forum

Thread: 4.3 to 350 swap

Page 1 of 3 123 LastLast
Results 1 to 20 of 57
  1. #1
    Registered User
    Join Date
    Dec 2010
    Location
    ky
    Posts
    39
    My Feedback

    (0% Positive Feedback)

    4.3 to 350 swap

    i am lookin for any help or advice at all on taking the 4.3 out of my truck and dropping in a carbureted 350, the truck is currently a 4.3 and 5 speed manual does anyone know what i will need or if it is worth the time? any help would be greatly appreciated

  2. #2
    Registered User dave89iroc's Avatar
    Join Date
    Sep 2007
    Location
    SE Michigan
    Age
    38
    Posts
    4,822
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    what year truck?
    ASE Master Certified Technician

    2000 Silverado 6.0 4L80E 2wd
    *RIP*1994 Z71 SCLB 355, Dart Heads, 10.5:1 CR, PM rods, CC XR270HR

  3. #3
    formerly P379XL SimpleGreen's Avatar
    Join Date
    Sep 2004
    Location
    Livingston, LA
    Age
    27
    Posts
    3,714
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    Did that exact swap (pretty easy). Then I got rid of the carb'd 355 and put in an LS motor like I should have did the first time.

    - 1993 C1500 - 5.3L/4L60E Swap - 3/5 Hotchkis - '96 Interior - Tuned by EPS -
    - 2013 Camaro 1SS/1LE - Borla - 1" Eibach Drop - Roto Fab Intake - Katzkins Interior -

  4. #4
    Registered User
    Join Date
    Dec 2010
    Location
    ky
    Posts
    39
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    its a 1994 c1500 w/t

  5. #5
    Registered User
    Join Date
    Dec 2010
    Location
    ky
    Posts
    39
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    only reason im doing a carbed swap is because my uncle gave me the motor

  6. #6
    Registered User
    Join Date
    Apr 2006
    Location
    mississippi
    Posts
    107
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    Pull the 6 put in the 8 buy or build you a 4bbl to tbi adapter plate, install a set of 350 tbi injectors, tbi v8 dizzy and memcal and convert that carbed 350 over to efi. it's really easy to I've done it on a couple trucks and it works very well. I actually built a 91 a while back that originally came with a v6/5spd intalled a 350 from a 92 Caprice and ran the v6 ecm and fuel system the only thing I changed was the injectors and it would scream, all that was before I started tuning. That truck running the ac would avg 16mpg with about a 40/60 hwy/city drive to work. It's a really easy and cheap swap to do, if your 350 is 85 or older than you'll need a flywheel to fit the 2pc rear main seal engines, and make sure you either have a pilot bushing or bearing installed in the crank of the new engine. But other than that change the frame motor mounts and the engine will bolt right in place. All the serpentine brackets from the 6v will bolt directly up to the 350, just make for certain you use a waterpump for that year truck because the newer serpentine belt waterpumps turn in the opposite direction of the older v belt driven waterpumps.
    chevyracer8262

  7. #7
    Registered User
    Join Date
    Dec 2010
    Location
    ky
    Posts
    39
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    thanks for the help guys, ive not really dealt with this newer stuff like fuel injection( ive mostly fooled with carburetors my whole life) someone told me i could get an intake and throttle body and put on the 350 and just reprogram my computer or find a v8 computer at a junkyard or something would i have to get a wiring harness to?

  8. #8
    Registered User dave89iroc's Avatar
    Join Date
    Sep 2007
    Location
    SE Michigan
    Age
    38
    Posts
    4,822
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    Quote Originally Posted by jstewart View Post
    thanks for the help guys, ive not really dealt with this newer stuff like fuel injection( ive mostly fooled with carburetors my whole life) someone told me i could get an intake and throttle body and put on the 350 and just reprogram my computer or find a v8 computer at a junkyard or something would i have to get a wiring harness to?
    4.3 wiring harness will work, might need to extend or get creative with routing

    as for the computer, all you really need is the prom for a v8, computer itself is the same
    ASE Master Certified Technician

    2000 Silverado 6.0 4L80E 2wd
    *RIP*1994 Z71 SCLB 355, Dart Heads, 10.5:1 CR, PM rods, CC XR270HR

  9. #9
    Registered User
    Join Date
    Dec 2010
    Location
    ky
    Posts
    39
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    im one step closer, i had a friend give me the computer out of a truck he junked, i just leveled my truck out and dont really want to mess with how it sets right noe, will i need to get a set of coil springs from a v8 truck or are they different?

  10. #10
    Registered User
    Join Date
    Apr 2003
    Location
    Ft.Lauderdale, Fl.
    Posts
    558
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    Don't need to worry about the springs at all. They will work fine, as is.

  11. #11
    Its always somethin Ghostyman25's Avatar
    Join Date
    Jul 2009
    Location
    Atlanta,La.
    Age
    24
    Posts
    903
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    Very minute drop on the v6 springs in a fullsize. Was perhaps a quarter inch on my dads 4x4.
    White 1993,c1500,rcss,--TOTALED 8/20/10
    White 1999 1500 / Rcsb-TOTALED 5/19/11

  12. #12
    Registered User
    Join Date
    Dec 2010
    Location
    ky
    Posts
    39
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    thanks for the help, does anyone have any suggestions on a cam, nothing to radical or anything as ill be running a stock bottom end until i can afford a build

  13. #13
    Its always somethin Ghostyman25's Avatar
    Join Date
    Jul 2009
    Location
    Atlanta,La.
    Age
    24
    Posts
    903
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    Quote Originally Posted by jstewart View Post
    thanks for the help, does anyone have any suggestions on a cam, nothing to radical or anything as ill be running a stock bottom end until i can afford a build
    We need to know what block and what heads you have.
    White 1993,c1500,rcss,--TOTALED 8/20/10
    White 1999 1500 / Rcsb-TOTALED 5/19/11

  14. #14
    Registered User hammer137's Avatar
    Join Date
    Feb 2008
    Location
    Springfield ON, Canada
    Posts
    96
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    Ahh the dreaded cam question once again =P If you're using the stock TBI system and computer, your choices are VERY limited without opening a whole can of worms.

    81' Silverado 377 SBC, built 700R4, 4:11 Eaton
    96' C1500 project...
    Many thanks to Bill Little ofBelmont Automotive
    Klassen Auto Parts
    Pro Racing Fuels

  15. #15
    Its always somethin Ghostyman25's Avatar
    Join Date
    Jul 2009
    Location
    Atlanta,La.
    Age
    24
    Posts
    903
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    IIRC its limited to 4.80 lift max and 4.70- is recommended for the TBI's.
    White 1993,c1500,rcss,--TOTALED 8/20/10
    White 1999 1500 / Rcsb-TOTALED 5/19/11

  16. #16
    Cajun Road Warrior dualtbi88's Avatar
    Join Date
    Oct 2006
    Location
    Patterson,LA
    Age
    44
    Posts
    600
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    since this is your first TBI swap. Stick with a stock cam and components. If you start trying to get PERFORMANCE out of a sytem you bearly understand you will never get it running right; you'll get fustrated and do a hack job carb transplant like Ive seen so many shade tree mechanics do. Just stick to the basics for now. Get a stock TBI cam and lifter kit.

    What did the engine come out of?
    Paul R
    88 Step Side Modified ZZ4 Offenhauser Cross Ram dual TBI, Crane roller cam, FJO injector driver. Hand built serpentine drive.
    still under construction

  17. #17
    Registered User
    Join Date
    Dec 2010
    Location
    ky
    Posts
    39
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    its a reman 350 the block is a 79 model whats a good clutch set?

  18. #18
    Cajun Road Warrior dualtbi88's Avatar
    Join Date
    Oct 2006
    Location
    Patterson,LA
    Age
    44
    Posts
    600
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    I know centerforce has some decent clutches, but be carefull about hard launches. That 5 speed isn't built to handle V8 torque. You'll wear it out or break it pretty quick. A TBI manifold will not fit those heads. You'll need a TBI to 4BBL adapter, just make sure you have a 180 intake manifold. That means each intake runner is routed to the intake port every other cylinder according firing order. That is how the TBI injectors fire, 180 of crank stroke. Otherwise you'll run the risk of some cylinders going lean and others being too rich.
    Last edited by dualtbi88; 12-22-2010 at 12:01 PM.

  19. #19
    Registered User
    Join Date
    Dec 2010
    Location
    ky
    Posts
    39
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    thanks do you know where i can get one of those adapters? i bought an edelbrock performer tbi intake from summit and didnt realize that it wouldnt work on those heads, is it because of how the bolt holes in the intake aremeant to go straight down into the head instead of at an angle?

  20. #20
    Registered User Static 90's Avatar
    Join Date
    Mar 2008
    Location
    Waco, TX
    Age
    46
    Posts
    1,892
    My Feedback

    (0% Positive Feedback)

    Re: 4.3 to 350 swap

    Summit has the adapter to run a TBI on a carb intake. http://www.summitracing.com/parts/TRD-2210/
    1990 RCSB 355/700R4 4/6 drop all DJM 15x8 Cragar V5's 255/60R15 BF Goodrich Radial T/A's
    My Garage my build thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •