[coyled]

You can get radically different lash readings when the motor is cold versus hot. Lash tends to be .015 or better hot, but tends to be much tighter cold which is one of the reasons they recomend plenty of lash. As far as performance goes, more lift generally helps performance at all rpm's. More duration tends to rock the torque curve up in the rpm band. Solid rollers allow for a steep ramp which limits duration but gives you tons of lift,ie. the best of both. Any minor lash adjustments away from cam specs can help the intake or exhaust side of the equation whichever is weaker. Usually, you are better off working on air fuel and timing for more performance, not much to be gained from lash adjustments as the cam manufacturers have it figured out. Scott