My Bullet cam has similar .050 specs, but less advertised duration and its on a 112 LSA. I run it with 1.65 ratio rockers. It seems like a mild/street cam to me with tons of low end, I run 3.42 gears.. The Bullet cam is very lively at all RPMs, but is basically done by 5500 rpm. I agree the summit cam doesn't seem too big for a 400 with adequate compression. I put both the Bullet and Summit cam in Desktop Dyno and the graphs basically overlay one another with the summit running out just a smidgen longer.
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