Product Description Specifications With a 2024 aluminum rocker and 8620 hardened steel shaft, this shaft-mount rocker system adds stability to the engine which frees up horsepower. This system features 1.5 ratio rockers for Pontiac V8 w/ P8 head. Category: Engine Components>Rocker Arms Core: N LTL: N MPN: 1518CPG Proposition 65: Y Special Order: Y