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5.3 in a k5

Discussion in 'The Garage' started by g_mo, Nov 10, 2006.

  1. g_mo

    g_mo 1/2 ton status

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    I got a lead on a 2000 5.3. Is it the same bellhousing bolt pattern as the 350? It will be mated to a sm465. Will the current flywheel and clutch work?

    Thanks in advance.
     
  2. 1979jimmy350

    1979jimmy350 1/2 ton status

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    yes you can bolt the sm 465 up to it, you will need a flywheel for the 5.3 though
     
  3. dhcomp

    dhcomp 3/4 ton status Premium Member

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    has anyone in this site done this swap?

    From driving the 5.3 in our 01 tahoe, its a decent motor, but always seems to want to shift. Never wants to climb anything at 2000rpm's like my tbi 350 does. Has anyone driven a truck as heavy as a K5 with that motor and a stick? Seems to me not having much low end torque would suck.

    ANyways, just somethign to think about!
     
  4. MattK

    MattK 1/2 ton status

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    from the searching i've done, it'll end up being a custom flywheel from advance adapters. it has to be thicker than a stock flywheel.

    and yeah it'll bolt up, it only uses 5/6 bellhousing bolts though.(not a problem)

    there is some info you can find by searching on this site. you should know that custom mounts will be needed in addition to a custom wiring harness.

    edit: the shifting problems you're experiencing are more of a tuning issue. the 5.3 has more torque than a tbi 350 ever came with. it's often they dont feel like it because from the factory these newer trucks are programmed with something called "torque management" to limit the load on the piece of junk half ton auto tranny gm still put in these trucks.
     
  5. dhcomp

    dhcomp 3/4 ton status Premium Member

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    I didn't think torque management was on 01 truck? I thought that was a way newer setup. I know the 5.3 has more torque, im just not sure at what RPM.
     
  6. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Nope, Torque Management started with the new generation of engines. That engine will have gobs of torque once you get it flashed without vats or torque management. It'll have plenty more power than your TBI 350
     
  7. MattK

    MattK 1/2 ton status

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    yup gen III small blocks all have that torque management. if my buddy scores the 6.0 h/o he's spyin on ebay, ill probably be buyin his 5.3 off of him. maybe a mild cam and a good tune and it should be makin some very reasonable power.
     
  8. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

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    expain this 6.0 h/o. I didn't realize there was an h/o version unless your talking about vette stuff
     
  9. gmc4cw

    gmc4cw 1/2 ton status GMOTM Winner

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    4.8L - 285 HP @ 5200 rpm, 295 lb-ft @ 4000 rpm

    5.3L - 295 HP @ 5200 rpm, 335 lb-ft @ 4000 rpm (iron block or flex fuel)

    5.3L - 310 HP @ 5200 rpm, 335 lb-ft @ 4000 rpm (aluminum block)

    6.0L - 300 HP @ 4400 rpm, 360 lb-ft @ 4000 rpm (345 HP on denali)

    8.1L - 330 HP @ 4200 rpm, 450 lb-ft @ 3200 rpm

    6.6L - 360 HP @ 3200 rpm, 650 lb-ft @ 1600 rpm (duramax turbo diesel):bow:



    and if anyone cares.
    4.3L - 195 HP @ 4600 rpm, 260 lb-ft @ 2800 rpm
     
    Last edited: Nov 10, 2006
  10. MattK

    MattK 1/2 ton status

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    well i say h/o but im not sure if thats the proper nomenclature. with the 6.0's there are 2 versions i am aware of. the lq4 and the lq9. the lq9 came along later and has a raised compression ratio along with some better numbers. the one my buddy is wantin to buy came out of an escalade.
     
  11. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

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    ah, got it. I remeber reading that the escalade/denalli motors made more power
     
  12. desertrat67

    desertrat67 Hawk Driver

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    One of the mags(Petersen's or 4wheeler) did a swap of a Gen III motor and the block design is different, so the had to modify the frame and make new motor mounts for it.
     
  13. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    You can use the factory mounts by making some adapters to bolt onto the block, then the factory engine mount cup onto.

    They are found on ebay dirt cheap, or are easily made yourself if you've got some time and the tools.

    If I understand correctly, there are no clearance issues less the AC pump's stock location, and the exhaust manifolds.

    There are aftermarket serp brackets that move the AC up up and out of the way, and I think it's the Camaro manifolds that clear the frame by hugging the block.
     
  14. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    I run a 6.0L-SM465-NP205 in my K5. and i run a 6.0L-NV4500-NP205 in my flatbed tow rig.
    Both use an advance adapters flywheel and pilot bearing spacer.
    The LQ4 is 9.5 :1 compression and runs on regular unleaded, the LQ9 is 10.5:1 and requires premium unleaded for the higher compression.
    Rule of thumb is if you want to build a Heads & Cam N/A engine go with the LQ9, if you want to add some boost or juice, the LQ4 is what you're after.
    Shoot me a message if you have any questions about the swap, we specialize in GenIII conversions at the shop.. i might be able to help you out.

    Ryan
     

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