You need to get the part number of the block and look. Others will tell you that they have color differences since they were built in two different facilities. Just so you know, the only difference in the ls6 block and the ls1 block is better breathing. Not a big deal if its a ls1 or 6 in my opinion.
Post a picture of the right side of the block, it's not hard to tell what it is. The LS6 intakes wound up on most '01s and all '02s. LS6 heads did not wind up on any standard LS1s, but LS2 heads are LS6 units without the sodium filled valves.
A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. Come join the discussion about performance, builds, restoration, modifications, classifieds, troubleshooting, reviews, and more!