Please check availability before ordering as cores are not always available. We offer this slider follower solid cam in 3 different versions depending on track length. The short track 4.1 version is .550" lift and operates from 3800-7600.  The mid length track 4.5 is .555" lift and operates best from 4000-8000, and the 4.9 is .560" lift and operates from 4200-8200RPM.