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5.3 or 6.0 ?

Discussion in 'Engine Swaps (Gas) LS, Vortec, LT1 , etc.' started by Double d, Aug 18, 2019.

  1. Double d

    Double d Junior Member

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    First Name:
    Double d
    Truck Year:
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    Truck Model:
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    Engine Size:
    350 sbc
    What’s the benefits for both I’m thinking about swapping from my worn out 350.

    What’s the easiest way donor truck or buying separate?
     
    Frank albrecht likes this.
  2. C10MixMaster

    C10MixMaster Full Access Member

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    Truck Year:
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    Engine Size:
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    i think a donor truck is the way to go. That way you know you got everything you need. including the transmission. But it depend on whats available to you at the time. 5.3 are easier to find and cheaper. 6.0 well there no substitute for cubic inches . I believe they're the same size. I'm still on the fence as to which swap im going to do 5.3 6.0 or a 350 tbi. When you do yours do a build thread so we can see your progress.
     
    Last edited: Aug 18, 2019
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  3. yevgenievich

    yevgenievich Full Access Member

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    V2500 burb
    Engine Size:
    5.7
    5.3 is good. If want more power and/or towing then 6.0 is better
     
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  4. Doppleganger

    Doppleganger Supporting Member Supporting Member

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    Truck Year:
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    Engine Size:
    5.7
    I've been asking the same question......have heard the 6.0 is a torque monster and better for towing.

    Dunno.
     
    Double d likes this.
  5. bucket

    bucket Super Moderator Staff Member

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    6.0 owner here. It's not a torque monster, but is better than the 5.3 of course. The power for towing is very comparable to my pre-smog '78 454. My 6.0 is just an early LQ4 though. A friend has a later one ('05) and seems a little stronger.
     
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  6. Madhorn

    Madhorn Full Access Member

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    First Name:
    Ken
    Truck Year:
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    Truck Model:
    K10
    Engine Size:
    5.3/NV4500/NP205/4:56 gear/35in tires
    I went with a 5.3 mainly because it was in a truck and I could hear it run before pulling it. Donor truck is the way to go if you can, especially if you are going to use both the engine and trans. LSx4U sells complete sets, engine-trans-harness as stand alone packages. I almost bought a 6.0 from them, but it was bit out of my budget.
     
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  7. JoeR Jr

    JoeR Jr Full Access Member

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    First Name:
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    Truck Year:
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    Truck Model:
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    Engine Size:
    4.3
    Donor truck will make your life easier. Lots of little crap you can use from it. You can also save/use the harness as you see fit.

    I did a 6.0 in mine. Put flat top pistons and a Brian Tooley Stage 2 Truck Cam. 4L80E Trans. Did my own tuning. With the stock 2.73 gears I got 18 MPG Highway and 15 MPG around Town.
    I just swapped in a set of 4.88 gears and a Spartan Locker. Mileage hasn't dropped much around town, but I haven't been on a road trip with it since the swap. I'm sure it will go down though.

    In my opinion, if I was building a daily driver, I'd use a 5.3 to gain a couple of MPG. If I was building it for power, of course get the added displacement if you can.

    Whatever engine you choose, I doubt you'll regret it. The driveability improvement is so nice it puts a smile on my face every time I drive it.

    Joe
     
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  8. eskimomann209

    eskimomann209 Full Access Member

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    First Name:
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    Truck Year:
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    Truck Model:
    C10
    Engine Size:
    5.3
    I’m in alignment with Joe.
    The power these trucks get from the 5.3 alone is fantastic. It makes it wonderful and worry free. I pondered long and hard over that or the 6.0
    My choice was based on the fact that I drive mine daily and over 70 miles round trip. So I opted for the MPGs and a cam
    The look I get from people when I easily pass them in my 73 is priceless. And she doesn’t even struggle
     
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  9. Jrgunn5150

    Jrgunn5150 Questionable methods

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    Truck Year:
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    Engine Size:
    6.slow
    CN, doesn't matter, just get a complete one.

     
  10. Frankenchevy

    Frankenchevy . Supporting Member

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    Guess I’m going to have to break down and sign up for Facebook just for the marketplace. No trucks rotting apart out here. People still want $5-10k+ for year 2000 and up silverados with 150-250k miles. There are occasional exceptions.

    I come across complete engines for 1000-1500 private party. Couple of dismantlers on crack want $2500 for a 5.3 and $3000 for a lq4.

    One guy I keep calling back that says he parts them out and when he does have them, he’s in the $600 ballpark.
     
  11. Jrgunn5150

    Jrgunn5150 Questionable methods

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    I tell people like you to travel to where they are cheap lol.

    Or LKQ will ship to any LKQ.

    Where there's a will, there's a way.
     
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  12. 4WDKC

    4WDKC Full Access Member

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    do not do a stock 350 tbi swap, you will be very disappointed. Same physical size, same cubic dollars to make fast.

    They are not.

    cheap 5.3 and turbo will make it fast as you dare.

    Id jump on one for $600 and get the 4l80 also.
     
  13. Jrgunn5150

    Jrgunn5150 Questionable methods

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    I have a guy in Ohio who does them all day for under 1k for engine and trans, he'll ship via Fastenal as well, it's less than 200 bucks there.
     
  14. Arkansas_V8

    Arkansas_V8 Proud Redneck

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    Truck Year:
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    Truck Model:
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    Engine Size:
    5.7
    The big one that interests me for my heavy Suburban is an 8.1 496.

    Not alot of support. But they are cheaper, and torques monsters.
     
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  15. roundhouse

    roundhouse Full Access Member

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    Truck Year:
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    Truck Model:
    K10
    Engine Size:
    350
    Don’t be afraid of the 4.8 either if you find a good deal on one
    Plenty of power

    Get a donor vehicle of you can find one
    There’s lots of wrecked Tahoe’s

    And do NOT buy an engine if you can’t hear and see it run

    And if you buy it without the whole donor car I assure you they will hack up the wiring harness and remove accessories from the engine etc

    I bought just the engine and it was a mistake
    I thought I didn’t need a donor vehicle since I was going to use a NV-3500. manual transmission

    You’ll spend a bundle on the fuel system
    You will need a tank and a different pump and some expensive fittings and hoses
    But the LS we eventually installed in the truck had 270k miles on it and it has easily double the power of the TBI 350 we pulled out
     
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