These hydraulic lifter cams are capable of 6000-plus rpm with stock springs and no valve float. For use with Andrews springs and titanium collars. OK for use with hydraulic lifters. Very broad powerband, 2800-6000 rpm. Upgraded EV7, for 92″ or larger street motors. Must check coil bind, valve-to-valve clearance and valve-to-piston clearance.. Made in the U.S.A..