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Lift, duration and even spring pressure is NOT what kills cams on the street. It is how aggressive the lobe is. IE, how fast it opens and closes the valve. A VERY aggressive ramp speed on a lobe will murder a valvetrain in short order on the street. Keep the lifter ON the cam and you will be fine. Ultra fast "closing ramps" where the cam basically falls out from under the lifter will munch parts.

Monte



But that is directly related to spring pressures. There is also valve seats and guides and lifters to worry about. And spring pressure will have an effect.