COMP Cams Camshafts 07-306-9 Hydraulic Roller - Xtreme Energy: For use in LT1 with custom tuning, headers, gears and 2200+ stall. Rough idle. CamShaft, LT1 290HR-12 COMP Cams Xtreme Energy XE290HR-12 Camshaft for LT1 Chevy COMP Cams Camshaft Lt1 290HR-12