Whether you are looking to resleeve your block, install billet main caps, or hone your cylinders, finding a quality machine shop that will do the work correctly is paramount to a good engine build. We've assembled this list from talking to the best LS1 shops and builders in the country to make your job a little easier. Be sure to do your homework beforehand, and when you're discussing your build with the guys at the machine shop, find out the scope of their services.
Installing new cam bearings and honing the cylinders will most likely need to be done, and the oil gallery plugs should be pulled so the block can be cleaned. You may also want to have the shop check the flatness of the deck, and if your assembly isn't balanced, the shop can do it for you.