Hydraulic Roller - Xtreme Fuel Injection (XFI): Strong mid-range and top end. Requires headers, gears and stall. Strong idle.; 280/288 Advertised Duration, 230/236 Duration .050", .576"/.570" Lift, 113 Lobe Separation; 2000 to 6000 RPM range; Recommended use with 1.6 rocker arm ratio; Must use bronze tip fuel pump pushrod when using high pressure or high volume pump
