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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.
 

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Yes you will most likely need a custom tune.
 

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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.
 
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