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Any Listings for Max Bore size for each engine? Particularly the 5.3?
That's been covered pretty well on here. The 4.8L/5.3L Blocks can be bored out to Stock LS1 5.7L Specs. Its strongly recomended that you have the block Sonic checked first before Over boring it that much.
Allot of good info there. Something that could be added for people looking for engine swap candidates, as it comes up quite frequently would be the VIN code I.D. for each.