Hope no one minds bumping this older conversation.

If two cams have duration 324 and 305, and both lift 0.65, the second one seems more practical. If we don't plan to rev high, or put high mileage on the vehicle, some of us want to stay with solid tappets, ruling out solid rollers. But those rollers could help in low rpm torque. I suppose they can ramp up faster. An example is 23-706-9 --- duration is only 263.

But for solid tappets, has anyone tried and preferred the MM305 cam with an add'l 4-6 deg advance? Even if the rpm range came down only 10%, that would still be appreciated. I think the MM305 p/n 23-630-5 sweet spot is 5000-7500. For most of us, that's a bit high.