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Bore 4.8 to 5.3

Discussion in 'Performance & Fuel' started by Chad513, Mar 28, 2011.

  1. Chad513

    Chad513 Rockstar 100 Posts

    Has anyone bored a 4.8 to a 5.3? I was told it's the same block, but I've also been told that if I bored the 4.8 I would blow my block quick because the 4.8 was the worst engine Chevy made. has anyone done this? Did it do a lot?
  2. Badbrad469

    Badbrad469 Rockstar 100 Posts

    if i'm not mistaken, they're the same bore, just different stroke
  3. Chad513

    Chad513 Rockstar 100 Posts

    What is the difference between bore and stroke? I thought the 4.8 had 4.8 liters of what ever and the 5.3 has 5.3 liters of what ever. Doesnt that mean that the 5.3 is bigger because it has more liters in it? If it has the same block then where is the other .5 liters at? I just want my truck to be faster lol
  4. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    X2 what Badbrad469 said, its the stroke that makes the diffeance. The 4.8 and 5.3 have a 96mm bore. They both can be bored to 99mm. The 4.8 has a 3.267 (83) stroke, the 5.3 has a 3.662 (92mm) stroke. If you bore a 4.8 to 99mm bore and add a 5.3 (92mm) crank you have a 5.7 (346 cu. in.) Add 2" intake valve to the heads and a LS1 cam, you basiclly have cast iron block LS1. Also the 5.3 and 6.0 share the same crank. The 4.8 and 5.3 have the same block, the 6.0 is a diffeant block. The 6.0 has a 4.00 (101.6mm) bore. Hope this info helps you fiquire out what you want to build.
  5. Chad513

    Chad513 Rockstar 100 Posts

    Thank you so much!!! That helped me a lot. that is definetely my next upgrade:) Would I have to tune it after i did all that?
  6. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    Yes you will most likely need a custom tune.
  7. Chad513

    Chad513 Rockstar 100 Posts

    Shiiiiiiiit. Thats more money lol
  8. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    Theres a book called How to Build High Performance Chevy LS1/LS6 V-8's by Will Handzel. Its printed by SA Design. You can fined it on-line or at a GM dealer part # 88958786. Its a great book, includes a truck section. Its a older book ownly goes to '04 but alot of the info still works on the newer truck. The books author,Will Handzell was at one time in charge of GM Performance. Read it from cover to cover it has a wealth of tech info about the LS series engines.
  9. clgoch187

    clgoch187 Rockstar 4 Years 500 Posts

    just pour in few liters, it easy! lol.

    but seriuosly, if was me id get heads off a 5.3 and port em, and a FAST 102 mm tb/mani set up with a good cam.
  10. Schaub

    Schaub Rockstar

    I heard if you reverse bore it to a 4.0 and install a tornado TB spacer you can pick up 10 mpg and 75hp.

    Really tho, I'd prolly just add some boost. I would think it would be easier and quicker than pulling the whole motor.
    Last edited: Mar 30, 2011

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