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4.3 to 5.0 swap

This is a discussion on 4.3 to 5.0 swap within the Technical / Maintenance forums, part of the General Discussion category; I was wondering what would be involved in swapping out a 4.3 v6 for a 5.0 v8. I have found ...

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    Registered User ABK1500's Avatar
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    Talking 4.3 to 5.0 swap


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    I was wondering what would be involved in swapping out a 4.3 v6 for a 5.0 v8.
    I have found many posts for the 4.3 to 5.7 swap. Is it because it is an easier swap? Or is it a easier engine to find? It is for a 98 k1500 with 5 speed,and I would look for a 5.0 vortec also, mixing tbi and vortec adds so much to the swap. I understand that the mounts would have to be changed, but will the engine bolt up to the transmission (and will the transmission will be able to handle it?)I also understand that you would need a new computer? Thank you for all help.

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    Homesick NBer
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    Re: 4.3 to 5.0 swap

    Quote Originally Posted by ABK1500
    I was wondering what would be involved in swapping out a 4.3 v6 for a 5.0 v8.
    I have found many posts for the 4.3 to 5.7 swap. Is it because it is an easier swap? Or is it a easier engine to find? It is for a 98 k1500 with 5 speed,and I would look for a 5.0 vortec also, mixing tbi and vortec adds so much to the swap. I understand that the mounts would have to be changed, but will the engine bolt up to the transmission (and will the transmission will be able to handle it?)I also understand that you would need a new computer? Thank you for all help.
    the trans will bolt right up, if the engine is from a 93to 95, then its no problem cause it would have the 4l60e trans behind it, which is what the 96up engines run, but if the engine is from an 88-92 then the trans will still bolt up but the pre 93 trans was the 700r4, same case, but not elctrontic, so yes it would handle it just fine.

    and yes 350s are easier to find than the 305, and most people would prefer to have the 350 anyway.
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    Diesel Nut justy's Avatar
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    Re: 4.3 to 5.0 swap

    People pick the 350 because they have a little more horsepower. About same fuel mileage as the 305. And also if a person wanted too they can get performance parts easier for the 350, then a 305. Although I see alot more performance parts for the 305 that camaro used alot.

    Transmission will work fine.
    Last edited by justy; 11-05-2007 at 08:38 PM.
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    Registered User ABK1500's Avatar
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    Re: 4.3 to 5.0 swap

    so the 305/350 will bolt up to the 5 speed just fine. I believe you need to get a new computer from the new motor, but where is the stock computer located? Also, all of the a/c, etc.. bolt up to the v8?

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    Registered User ABK1500's Avatar
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    Re: 4.3 to 5.0 swap

    Will the brackets and accessories bolt up? Where is the computer located?

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    6 cylinders of fury... 91 V6 4x4's Avatar
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    Re: 4.3 to 5.0 swap

    Quote Originally Posted by ABK1500
    Will the brackets and accessories bolt up? Where is the computer located?
    Another reason people go for the 350 swap. The 4.3 is the same engine with two cylinder chopped off, so most if not all the accessories will bolt right up. I want to swap my 4.3 out for a TPI350 within the next year.

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  7. #7
    claviz13
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    Re: 4.3 to 5.0 swap

    Skip the 5.0 and get a 5.7. You'll thank me later.

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    Registered User ABK1500's Avatar
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    Re: 4.3 to 5.0 swap

    does anybody have any good sources for engines?

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    Homesick NBer
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    Re: 4.3 to 5.0 swap

    the computers on 96 up trucks, are under the hood on the drivers side, in front of the fuse box. 88-95 the computer is behind the glove box, on top of the blower motor.
    2003 Chev Silverado 4x4 4.10 gears and it has a 4.8L
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    Diesel Nut justy's Avatar
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    Re: 4.3 to 5.0 swap

    I would get a hold of a vortec 350 (96-99), Go to a junkyard 1996-99 (c/k 1500) and grab a computer from a truck with a manual 5 speed. The computer is on driver's side under the hood. Then you can drop in your new engine and switch the computer.
    Last edited by justy; 11-08-2007 at 09:10 PM.
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    2006 arctic cat prowler 650 H1
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