Hydraulic Roller - Xtreme Energy: For use in LT1 with custom tuning, headers, gears and 2200+ stall. Rough idle.; 276/290 Advertised Duration, 220/230 Duration .050", .510"/.510" Lift, 114 Lobe Separation; 1800 to 5800 RPM range; Must use bronze tip fuel pump pushrod when using high pressure or high volume pump; Steel billet version of part #07-305-9 PartNumber : cca07-306-9 Description : COMP Cams Camshaft Lt1 290HR-12 Title : 07-306-9 CamShaft, LT1 290HR-12 Engine Components::Camshafts