Product Description Specifications These Ultra Pro Magnum rockers are made of black oxide coated 8650 chromemoly steel that can withstand up to 850 lbs of spring pressure. Featuring a 1.6 ratio, these rockers fit '88+ Chevrolet V6 with a 3/8" diameter stud. Category: Engine Components>Rocker Arms Core: N LTL: N MPN: 1618-12 Proposition 65: Y Special Order: Y