Was told it was livernois but it does not have any stampings on them. Im tearing the heads off this weekend and i can get pics but i just had the heads off not even 100 miles ago and you could see all the cross hatching. The short block came out of my 98 camaro that had 108,000 miles but the block is a 99+ ls1 block. You can tell because the oil sending unit on the back is a different size thread on the 98's.