4.125 bore block
#5
i have a brand new LS1 block, it was purchased as a short block and torn down to make into a stroker. i have since sold everything except the block and a couple misc things. the sleeves have a little surface rust on them from being at a storage unit that wasn't climate controlled for a few months. the whole thing was oiled down a long time ago for storage, but it didn't last forever apparently. it should just need to be honed. its only 70-80lbs, so i can ship it if you're interested.