The phrase "mild cam" refers to an engine camshaft that has a moderate level of aggressiveness. It means that the camshaft is not overly powerful or extreme, but still offers a bit more performance than a stock camshaft. Full definition
1965 Chevrolet C10 Older restorationRebuilt Small block 350 Chevy V8 with mild cam Rebuilt TH350 TransmissionFour barrel carb Power steering Has some rust in the bottom of the drivers door, several small dings and scratches. (shoppok.com)
Instead, there are two different intake cam profiles per cylinder: a very mild cam lobe with little lift and a normal cam lobe with moderate lift. (en.m.wikipedia.org)