RockerArm Adjt Screw, Rocker Adj Nuts Small Block Ford, Rocker Adjusting Nut Kit for Small Block Ford, None, This 4610-16 adjusting nut kit includes a set of 16 washers and nuts to convert your Ford 302 and 351 Windsor rockers to an adjustable valvetrain. Fits 5/16" studs., Engine Rocker Arm Adjusting Nut.