Manley's Extreme Duty exhaust valves are offered for Ford 4.6L and 5.4L small-block SOHC engines in sets of eight and target applications that demand exceptional force and heat resistance. Constructed from XH-432 XtremeAlloy with chrome stems and hard tips, they feature swirl-polished under-heads and fully machined combustion faces to improve airflow and durability in top-fuel, drag, and severe-service contexts.
Manley Ford 4.6L/5.4L Small Block SOHC Extreme Duty Exhaust Valves (Set of 8)