"We prefer not to quote cam specs and instead recommend cams by application, as the normally published specs are often misleading. The cam that we normally use in our street performance engines has 264 deg of intake duration and 268 deg of exhaust at .020 lift, with .285" lift at the cam and 110 deg lobe centers. But this tells you nothing about the most important design element of the cam - the shape of the lobes. More important than the duration at .020 or .050 lift, is the duration at .100, .200, etc. Our cams, especially the street cams, are designed to have as little overall duration as possible in order to assure that power and torque increases are produced throughout the RPM range with no loss of low and midrange power. With lobe shapes that open the valves more quickly than other cams with similar low lift durations, they have more duration at mid to higher valve openings, and produce more power. As the optimum requirements for the intake and exhaust are different, our cams typically have durations and lobe shapes designed to meet the separate requirements of the intake and exhaust. Cheaper cams use one profile for both. The result is that our cams produce power increases over a broader RPM range without sacrificing low and midrange power and torque."

An Isky S-66 profile also has 264 degrees of duration at .020" lift & it has more lift with .298" which would mean that it probably has more lift at .100" & .200", so it would produce more power, right?