For Chevy SBC 350 1.6 Ratio 7/16" Outlaw Aluminum Roller Rocker Arms Set Fit most all small block Chevy stock and aftermarket 23 degree cylinder heads. Aluminum ROLLER ROCKER ARMS Kit For Chevy SB 1.6" 7/16, 16 CNC Aluminum Arms With Polylock Nuts Creates less friction, allows more accurate valve adjustment and has extreme rigidity Lightweight with integral push rod seat Not self aligning