For Small Block Chevy 283 327 350 Stainless Steel Roller Rocker Arms 1.6 Ratio 3/8" Stainless Steel Roller Rocker Arms Kit For Chevy SB 1.6" 3/8, 16 CNC Stainless Steel Arms With Polylock Nuts Creates less friction, allows more accurate valve adjustment and has extreme rigidity Not self aligning Fit most SBC small block Chevy Full roller rocker