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383 Stroker or 6.0 LS??

Discussion in 'Engine Swaps (Gas) LS, Vortec, LT1 , etc.' started by Rashad Baker, Jul 10, 2020.

  1. Rashad Baker

    Rashad Baker Member

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    Yeah I never thought about the 8.1L, truthfully I didn’t even know it was an option. All I really hear about are the 5.7, 6.0, and 6.2


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  2. Rashad Baker

    Rashad Baker Member

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    How much more work is it to use the 4L80E with the 383?


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  3. Rashad Baker

    Rashad Baker Member

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    Can anyone let me know what they are seeing as far as mpg with a 383 in their burb?


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  4. SquareRoot

    SquareRoot Full Access Member

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    Ya. Gas mileage is gonna suck with a squarebody no matter which engine you choose. You'll be splitting hairs over nothing.

    If you're starting from scratch, go with an LS. Dollar for dollar, it's a better deal in the end for hp and reliability.

    Vbb makes valid points but that doesn't change the facts. If gen 1 small blocks were so great why is GM producing LS motors. Technology moves forward. If you already have the components and want to save money, well, you've got a decision to make?
     
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  5. eskimomann209

    eskimomann209 Supporting Member Supporting Member

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    I have thought about the 8.1 but I hear nothing but arguments about it and don’t see many people actually running them. I don’t feel like pioneering it. I wanna put one in my 98 c1500 tho.
    But odds are it’ll get the 6.0 Or I’m doing the 5.3 bored to 3.904 with a stroker crank. It’ll be pretty close to a 383 and be an LS.
     
  6. shiftpro

    shiftpro Full Access Member

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    350, 383, 454, 496!
    Average $500 controller need to shift it.
     
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  7. Dutch Rutter

    Dutch Rutter Full Access Member

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    @eskimomann209 I'm right there with you. And everyone makes very good points. The one i know of and really what got me interested in the 8.1l was a guy screen named Dirtylarry over on the 67-72 forum. While most other things on that site are hit or miss at best. His build up was very thorough and detailed from start to end. I also really like the nv4500 and np205 setup he did.

    http://67-72chevytrucks.com/vboard/showthread.php?t=298696

    That being said. Its production stopped in 2009 and it was replaced with the 6.0. Probably for a reason decided by the bean counters and engineers at gm, as well as stricter emissions standards.

    One thing I think we can all agree on, a 350, 383, 454, 5.3, 6.0, 8.1 really whatever engine to put into a square is a very fun choice to be stuck with.
     
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  8. Shorty81

    Shorty81 Baby Boomer

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    Made my own 8.1. Stroked, bored 454. LOADS of torque. IMG_20171124_150352.jpg
     
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  9. Jethro224

    Jethro224 Full Access Member

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    And purrrty!
     
  10. Rashad Baker

    Rashad Baker Member

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    What type of mileage are you getting? How many miles have you put on it so far?


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  11. RoryH19

    RoryH19 Full Access Member

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    My thoughts from someone that LS swapped a 4x4.

    As mentioned, you are miles ahead with having a '90 FI truck.
    You have the proper gauge cluster, and electronic t-case for VSS.
    You also have the FI fuel tank and correct sender. Just need a different fuel pump.
    Since you are traveling cross country it's nice to have cruise control. Very easy to setup if you buy a DBW version.

    Since you will be towing most of the time, find a 3/4 4x4 ton donor pickup.
    Take the 6.0 (LQ4) and 4L80e along with all accessories, computer, rad, e-fans...
    It will make the swap easier and you know it will all work together.

    I used an 04 Escalade as my donor.

    The 1 issue you will have to address on the NP241c T-case is that it will be 27 spline. 4l80's need 31 spline.
    You can either order the parts to convert or find a junkyard Np241c from a 90-91 3/4 ton burb.

    Just my initial thoughts.
    You can see my build in the link below.

    Not telling you which way to go, just giving some info.
    Good luck.
     
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  12. Shorty81

    Shorty81 Baby Boomer

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    Well, it's a K20, SM465 manual tranny. Not daily driver. Driven easily it gets 10-12 mpg. I've put 11000 on her so far. Not a over built engine. 781 iron heads, mild cam, 750 Holley. Very happy engine.
     
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  13. Rashad Baker

    Rashad Baker Member

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    Appreciate you sharing your experience. What type of mileage are you getting? Did you go with the 6L/4L80E setup?


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  14. 82sbshortbed

    82sbshortbed Get outta there! Supporting Member

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    7.4L BBC?
     
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  15. The88

    The88 What's broken this time?

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    Could possibly get a full parts truck from copart for a decent price.
     

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