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Thread: 4.8 build

  1. #1

    Default 4.8 build

    So here is the deal. I have a 2004 ext cab Z-71 with a 4.8. I recently picked up a 5.3 that needs some work CHEAP. Everything I've read and everyone I've talked to says the only difference between a 4.8 and 5.3 is the stroke (correct me if I'm wrong). Anyways I have been doing some reading about the crank swap from my 4.8 to the 5.3. Would I have to upgrade anything else to do this? I know I would have to get a crank case relearn for it to run and get my ECM reprogrammed. All I need to know is if I would have to do anything else. Also I've seen a lot about LS1 cam swaps in the 4.8 and 5.3s. Would I be able to have more of a HP gain with the 4.8 or the 5.3? I'm planning on getting a custom tune with all of this to really set it free. Any additional info and input would be GREAT. Thanks for reading

  2. #2


    Yeah the only difference between the 4.8 and the 5.3 is the stroke. The 5.3 also has different pistons and connecting rods. If you swap the crank you will also have to swap your pistons and connecting rods.
    The 5.3 and 4.8 depending on year, put out close to the same amount of horsepower, but the 5.3 produces more torque.
    Also, any parts that can bolt onto an ls1 will bolt onto the 4.8/5.3/6.0 engines.

    Hope this helps and goodluck
    '00 1500 4x4 4.8l
    single glasspack
    daily driver/workhorse

  3. #3


    Welcome to the club. Why not rebuild the 5.3? If you bore the 5.3 from 96mm to 99mm and use the 5.3 crank you have a 5.7. Change the intake valves from 1.89 to 2.00 and install the LS1 cam (the same came used in the LQ4 and LQ9 6.0's) you basicly have a cast iron block LS1.

    2005 Chevy Silverado Z71 Crew Cab
    6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
    17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
    4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
    Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
    B&M aluminum deep transmission pan
    Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
    Weather Tech floor mats
    Cover-Craft seat covers
    Dash mat cover
    Formula One window tint
    One black Lab in rear seat.

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