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The 351-HO’s fully adjustable heavy-duty valvetrain components include 1.94-inch intake/1.60-inch exhaust valves, roller rockers, dual valvesprings, heavy-duty retainers and keepers, 5/16-inch-diameter hardened pushrods, pushrod guideplates, screw-in rocker-arm studs, antigall valvespring seats, and PC-type valve stem seals. Most of these parts are also available separately. View Related Article
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