[HPaddict]

exactly what i thought, i think they are a sales gimik personaly. i am a big fan of hydraulic cams especially on street motors i believe they can easily match a solid cam for performance up to certain point for sure. im in perth australia. i work at a well respected performance shop as an engine builder, i see so many people get sucked in by different gimiks and fads all the time, you guys probably see the same thing i guess. its very frustrating trying convince people they dont actually need certain things or have been given the wrong information. i also believe you can loose a certain amount of the cam profile due to a fast collapsing lifter. and as for pump up, any lifter will pump up if there is valve float even anti pump ups if they are set wrong, but an anti pump up will just stabilize quicker. as far as i know a anti pump up should be set a about only 0.002 preload which is really the reason why they might extend rev range compared to a standard lifter. if a stiffer lifter is set to the same preload of 0.002 it will do exactly the same thing and also deliver more of the cams profile as a bonus. i am amazed how many so called performance specialists dont truly understand the way hydraulic lifters actually work. anti pump ups should really be called a fast bleed lifter as they dont stop pump up they just stabilize quicker. at the end of the day theres no substitute for the right valve spring. i get sick of hearing hydraulics suck just put a solid cam in it.