Feature●Chevy Small Block. 1.5:1 ratio with 7/16" stud diameter. Set of 16 rocker arms and poly locks.●Extra large full needle bearing trunnion●Withstands spring pressures up to 700 lbs●Chrome-moly push Rods recommendedDescription Elgin Pro stock high performance stainless steel roller rocker arms for Chevy small block. 1.5: 1 ratio with 7/16" stud diameter. Set of 16 rocker arms and poly locks.