Hydraulic Roller - XFI XE-R: Xtreme Energy XE-R design for standard displacement LS6 and LS1. Race only applications. Custom tuning required.; 281/283 Advertised Duration, 232/234 Duration .050", .595"/.598" Lift, 112 Lobe Separation; Use Dual Valve Spring part #26925-16 with this camshaft
