04 z71 Motor bad - rebuild 5.3? add cam or 6.0?

Discussion in 'Performance' started by Fast LT1, Aug 9, 2018 at 12:45 AM.

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  1. Fast LT1

    Fast LT1 TYF Newbie

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    My 2004 Z71 Tahoe motor finally is biting the dust, loosing a main bearing and oil pressure is erratic. So i need to either pull it out and overhaul it and add a cam or buy a 6.0l and swap them. Not sure what all my options are here, vehicle is mostly used for over landing and 4 wheeling and isn't my daily driver, but would like to retain readability.

    current mods
    295/65r18 (33.4") Goodyear Wrangler Duratracs
    Traxda keys up front w/ 2" spacers in rear
    Opened up the intake runners and exhaust ports myself when i replaced the heads
    volant cold air intake
    Shorty Headers from summit - cant remember brand
    will do e fans and black bear tune either way i go

    So what are your thoughts? Cam the 5.3l or buy a 6.0l
     
  2. swathdiver

    swathdiver Full Access Member

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    Cost wise, it may be less expensive to acquire a used LQ4/LQ9 and drop it in. But you don't always know what you're getting so rebuilding the 5.3 or the 6.0 and selling off the 5.3 to offset costs would give you the reliability you're after. You'd get some more torque and horsepower too, more with the 6.0s.

    I like to work with what was there originally and rebuilding the 5.3 would be my first choice. At the very least put in a L33 camshaft, don't go too big or you'll be moving your torque band way high. You could always bore it .060" over and stroke it too!

    A fun build for me would be to turn my 5.3 into a 6.6 with 4" wet sleeves and a 4" crank.
     
  3. Walkercraig01

    Walkercraig01 Full Access Member

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    how many miles does your 5.3 have
     
  4. Fast LT1

    Fast LT1 TYF Newbie

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    5.3 has 180k on it. 6.0l would have similar mileage but i would also go through it and re bearing it and re ring it.
     
  5. cmc76

    cmc76 Full Access Member

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    I have been toying with this too.
    189k on mine. Does run well. But one day it wont
     

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