Check with Partick G on LS1tech. Check out this link. This is one of his grinds in a LS6.
http://ls1tech.com/forums/dynamometer-results-comparisons/1213394-baby-eps-cam-lays-down-430rwhp-415rwtq-track-results.html
http://ls1tech.com/forums/dynamometer-results-comparisons/1213394-baby-eps-cam-lays-down-430rwhp-415rwtq-track-results.html