You don't need a specific compression ratio for the cam to work, all that does is delay the torque onset and soften low speed response.
i may not 'need' an exact c.r. but need enough for it to work well. the stock pistons with that cam would likely be a dog off the line. i am less concerned with peak numbers than i am overall performance. while it may not be a huge cam, its enough that i already question what/how much i gave up off idle.
