Product Description Specifications Perfect for street performance, our 8620 chromemoly steel Magnum roller tip rockers can handle up to 350 lbs of spring pressure. These 1412 rockers feature a 1.52 ratio for 3/8" stud Chevrolet 265-400 Small Block. Category: Engine Components>Rocker Arms Core: N LTL: N MPN: 1412-16 Proposition 65: Y Special Order: Y