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The Manley Severe Duty exhaust valve set is built for extreme gasoline engine temperatures and high-stress applications. Made from exclusive XH-428 (exhaust) and NK-844 (intake) alloys, each valve includes chrome stems, hard tips and swirl-polished underheads with machined combustion faces. Fatigue testing at 40,000 psi and 1400°F showed Manley exhaust valves lasting 100 million cycles versus competitors' shorter lives.
Manley S/D 1.840/+.100 Severe Duty Exhaust Valves (Set of 8)
