The Lunati cam has slightly less advertised duration, the same duration at .050, but more lift and slightly faster ramp rates. It also has 1° more advance built in. The GM Hotcam drops in on a 109° ICL and the Lunati a 108°. The difference in performance would be pretty negligable between the two. The Lunati has .536/.536" lift with 1.6s. I bought the Lunati cam dirt cheap when Lunati was clearancing them a couple of years ago. They were ssomething like $80.00 shipped.