Intake part number
Did a search with that number and found 2 pages of hits. From this link https://ls1tech.com/forums/showthrea...light=12556333 it shows it's an LS1 intake manifold from a 97-00 Corvette = p/n 88894095 (formerly 12557846, 12556333). Sounds like you got screwed if you bought it thinking it was an LS6 intake. Did you buy it from a member of this board? 
