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Thread: Bore 4.8 to 5.3

  1. #1

    Default Bore 4.8 to 5.3

    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. #2

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

  3. #3

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    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
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  4. #4

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    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. #5

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    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. #6

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    Yes you will most likely need a custom tune.

  7. #7

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    Shiiiiiiiit. Thats more money lol

  8. #8

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    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. #9
    Master Mechanic clgoch187's Avatar
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    Default

    Quote Originally Posted by Chad513 View Post
    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
    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.
    03 Silverado 1500
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  10. #10

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    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 by Schaub; 03-30-2011 at 07:42 PM.

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