Product Description Specifications Our rocker arm and pushrod kit for Chevrolet 396-454 Big Block includes a set of our 1.72 ratio Magnum rockers, 8.280" long intake and 9.252" long exhaust High Energy pushrods. Category: Engine Components>Rocker Arms Core: N LTL: N MPN: RP1411-16 Proposition 65: Y Special Order: Y