The more duration the cams have. The more lobe you will have at an idle. A cam with 250 duration is a lot smoother then a cam with 280 duration. Also when you have more duration. Your power band moves up the scale, and you will have less low end torque. This is a general rule of thumb. With VVEL and other things that the computer can do. The computer can smooth some of it out, but not all of it.
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