Rocker Arm - Shaft Mount - 1.65 / 1.55 Ratio - 0.650 Offset Intake - Full Roller - Steel - Natural - Aluminum 13 Degree Dart - Small Block Chevy - Kit Vendor T AND D MACHINE MPN 2126S-165PLUS100/155 Truck Freight NO Steel Rocker Arms (0727). Spring Oiler Option (0720). 0.650 Offset Intake Rocker. 1.65 Intake Ratio. 1.55 Exhaust Ratio