Before dumping a bunch of money re-sleeving the block I hope your aware that the LS2 block is probably the best bang for the $$$$ in LS performance. Pricing a new block at Summit.....they are $1120.00. I would reuse your existing parts and buy a set of shaft rockers before spending the $$$ for an LS3 upgrade.....I take it the motor is pretty low mileage and all other 7 cylinders are in good shape. Sleeves are great if you plan on dumping a big load of N2O or blower/turbo upgrade, if your staying normally aspirated there isn't any big advantage in installing a set of sleeves. You might want to check over on the Corvette Forum, LS1 Tech or other sites for a quality LS builder if you don't already know of one. Good luck on the rebuild, I really like your Bird!
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