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Thread: chevy 4.3 vs 5.3

  1. #1
    TubeToy TubeToy's Avatar
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    chevy 4.3 vs 5.3

    I am looking into putting a 4.3 or a 5.3 vortec into my new buggy.
    I need to know the pros and cons on both motors and what year and truck to get one out of ?

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  3. #2
    Virile agitur Tacoma's Avatar
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    If those are your options, there is really no argument in favor of the 4.3 except possibly cost. The 5.3 owns the 4.3 in every respect except that.

    Search, the pros/cons have been discussed at length here and elsewhere on the web.
    I cried like a 12 year old girl during The Notebook!-- Jeremy Pool

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  4. #3
    By endurance we conquer mesha's Avatar
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    I have a 4.3 vortec in my buggy and want a 5.3. I was really mad at the 4.3 then got lower gears and now I am not so mad. I will just keep it now.
    Davy Houle

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  5. #4
    is this like what do I do drink beer or not???
    Eatrocks not chocolate
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  6. #5
    Registered User utah340six's Avatar
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    what a ds kev.
    the 5.3 weighs a ton more takes up more room.
    more gas
    more plugs
    more heat
    .
    4.3
    close to same power
    less weight
    less room
    less gas
    goes faster then you will ever go.
    his top speed 20fph feet per hour.
    because he cant drive.
    just likes to foll over and play dead.

  7. #6
    TubeToy TubeToy's Avatar
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    ya ya thanks tom! lol

  8. #7
    TubeToy TubeToy's Avatar
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    The cost on both are about the same for the motor and the ECU, and i am still looking into the wiring part of it all.
    What years do they run from on the vortecs, Or what years are the best to look for and witch years have the most problems and why, thanks
    Last edited by TubeToy; 05-03-2011 at 10:40 AM.

  9. #8
    Ah ok The 4.3 is old school based on the 55 to 99 small block. As such is heavy and has a poorer power to weight ratio. The 5.3 in its cheapest form, LM7 block from a 2002 to 2007 truck, is about 295 hp and 315 lbs. In a package that is all of 430lbs. It’s not much bigger than the 4.3, a L33 5.3 is a round 330 lbs. and is pushing 340 hp the 5.3/LSX will respond easy to a new cam and get another 100 hp
    Eatrocks not chocolate
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  10. #9
    But stuck more often. UNSTUCK's Avatar
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    Quote Originally Posted by eatrocks View Post
    is this like what do I do drink beer or not???
    No it's more like, "A dana 60 is stronger then a dana 44".


    If you haven't built the buggy, then engine size doesn't matter.
    I don't think you will see much if any MPG difference.
    As long as the 4.3 is MPI, wiring is about the same.

    Only real concern is height. The 5.3 in stock trim is pretty tall. The pan can interfere with links and such. I believe the 4.3 MPI is much shorter. If you want to spend some extra money, you can make the 5.3 very short with a car oil pan and intake.
    You can see my work here: jamfabrocks.blogspot.com. New projects updated 5/13/11!

  11. #10
    Internally speaking the 5.3 is far superior to the 4.3. The 5.3 is only about 4" longer than the 4.3. The 5.3 can get as good or better fuel economy than the 4.3. The 4.3's design will tear itself apart due to the way it's balanced, ask me how I know! If you go with a 2007 and up 5.3 they are all aluminum. Another engine to not over look is the 4.8, it's also a very strong motor. Thats my 2 cents......
    84 Suburban - Chopped, bobbed and caged - 6.0L LS - bored, balanced, studded, boosted - 1 tons, 80E, 205, 37's

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