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4.3 to 5.7 swap engine mount question.

This is a discussion on 4.3 to 5.7 swap engine mount question. within the Technical / Maintenance forums, part of the General Discussion category; Alright guys, I'm currently halfway through my 350 swap and I'm having trouble with the old v-6 mounts. The truck ...

  1. #1
    Registered User enederhoff's Avatar
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    4.3 to 5.7 swap engine mount question.


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    Alright guys, I'm currently halfway through my 350 swap and I'm having trouble with the old v-6 mounts. The truck is an '89 c1500. I cannot seem to get the old mounts off due to the fact that I cant find a way to get the bolts out. There are nuts on the backside, but it is almost impossible to get a wrench or socket on them. It almost seems that I'll have to compress the coil springs and unbolt the lower A-arm. There has to be an easier way to do this. Any input is greatly appreciated!
    1989 Chevy 1500 4.3 V6. 350 swap in progress.
    DSOC #67 b16a3 del Sol.

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    Registered User enederhoff's Avatar
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    Re: 4.3 to 5.7 swap engine mount question.

    ttt guys, hoping for a little help as I plan on working on this tomorrow!
    1989 Chevy 1500 4.3 V6. 350 swap in progress.
    DSOC #67 b16a3 del Sol.

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    Re: 4.3 to 5.7 swap engine mount question.

    Been there. The answer is:....Leave the V-6 mounts(frame mounts) where they are. Use them as they are. I fabricated engine block mounts, that bolt perfectly to the V-6 frame mounts. They consist of simple flat steel plates that bolt to the block, with two steel ears that drop down, that you can slide a bolt through. And they don't have to be made from thick material either. Mine are fabbed from approximately 3/16" steel plate. Very simple to make & paint. Hope this helps.

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    Re: 4.3 to 5.7 swap engine mount question.

    Oops. Just realized you might be installing a regular Generation 2 350 motor. My bad. What I suggested applies to Generation 3 or 4 LS series engines, into an OBS Chevy truck, that had a V-6 in it originally.

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    Registered User enederhoff's Avatar
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    Re: 4.3 to 5.7 swap engine mount question.

    Thanks for the response, but yes the motor im using is a second gen 350.

    Now I know quite a few guys on this site have done this swap but there is no additional info to be found on removing the old mounts. Anyone else got anything?
    1989 Chevy 1500 4.3 V6. 350 swap in progress.
    DSOC #67 b16a3 del Sol.

  6. #6
    Registered User dave89iroc's Avatar
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    Re: 4.3 to 5.7 swap engine mount question.

    extension, and a swivel socket to hold the nuts

    a\or, cut the old bolts, and use new bolts/nut, will still need a swivel socket and extension, but its easier to do, if the bolts come from the bottom
    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

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    Registered User enederhoff's Avatar
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    Re: 4.3 to 5.7 swap engine mount question.

    When I go to put the socket/swivel/extension it seems I can only get to one or two of the nuts. I'll hafta give it another go..
    1989 Chevy 1500 4.3 V6. 350 swap in progress.
    DSOC #67 b16a3 del Sol.

  8. #8
    Registered User enederhoff's Avatar
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    Re: 4.3 to 5.7 swap engine mount question.

    Also, is the starter from the 4.3 the same as the one on the 5.7? It bolted up but are the teeth the same as well? Figured I should try and make sure before going to start it and have the wrong starter..
    1989 Chevy 1500 4.3 V6. 350 swap in progress.
    DSOC #67 b16a3 del Sol.

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    Re: 4.3 to 5.7 swap engine mount question.

    Is your truck 5 speed or auto? I have one thought about putting a v-8 in and wonder if the flywheel is the same for v-6 and v-8.

  10. #10
    Registered User dave89iroc's Avatar
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    Re: 4.3 to 5.7 swap engine mount question.

    they call for the same auto trans flexplate, yet different manual trans flywheels

    starter will work for both

    I would honestly use the flywheel, but that is me
    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

  11. #11
    Registered User enederhoff's Avatar
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    Re: 4.3 to 5.7 swap engine mount question.

    My truck is an auto, figured they were the same, but had to make sure.
    1989 Chevy 1500 4.3 V6. 350 swap in progress.
    DSOC #67 b16a3 del Sol.

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