I was just reading about that the other day. Im still not sure of the specs other than its 387 cubes from a C5r block and a F1R 2000 cfm race blower. Check out this link to his shop...its incredible
http://www.web-pace.com/ls1.htm
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if it's cheap & reliable, it ain't fast, if it's fast & cheap, it ain't reliable, if it's fast & reliable, it ain't cheap