Time to start filling the Dart block; first up was this Lunati hydraulic roller tappet camshaft (PN LUN-60213, $320). Choosing the right camshaft can be a daunting task. After talking with Dart and Twedt we settled on this 241/239 duration, 0.625 lift, 110 LSA stick. As Twedt says, “We could have added more duration, but that would have moved our powerband to a higher level, and with this cylinder head all we would have done is post a larger horsepower number, but sacrifice the good mid-level torque number we were shooting for.” The cam was then degreed by checking the valve’s opening and closing figures at 0.050-inch lift. Twedt found that our numbers were spot on with what Lunati specified.