as the standard valve --> piston clearance is on the raggedy edge a standard, to use fast road cams on a standard engine are they just a higher peak, or longer duration with standard peak opening hight.
I thought at first longer duration, as higher lift would mean smacking pistons. but then also if the valve was open for slightly longer there would be more overlap and chance of smacking piston there too.
I need some guidance too, just for my own piece of mind, it wasnt even my question.
basically the duration is already quite tight on the standard pistons, so wilder cams cram more lift into the same duration, which means the valve train is put under more stress, due to the acceleration needed.
by opening up the piston pockets you can start to extend the duration and have the same lift, but not so wild a ramp.
The hydraulic lifters are quite robust until you start asking them to move around too quick - all too often these uprated cams can start 'em tapping and generally playing up..