Sportsman Roller Tip Rocker Arms for Small Block Chevy 262-400, 1.5 Ratio for 3/8" Studs, Self Aligning 4340 steel rocker body Includes lock nuts and pivot balls Adds up to 30 HP over stock rockers Excellent replacement for stock, sportsman, or circle track engines Eliminates noise & slop associated with worn or high milage rockers