Manley 11817-8 - Dart Big Block Pro 1 Stock Length 11/32in Stem Dia Severe Duty Intake Valves (Set of 8)

Manley 11817-8 - Dart Big Block Pro 1 Stock Length 11/32in Stem Dia Severe Duty Intake Valves (Set of 8)

Exhaust Valve - Severe Duty - 1.900 in Head - 0.342 in Valve Stem - 5.422 in Long - Stainless - Big Block Chevy - Set of 8

Manley Valve - Exhaust, Valve-BBC S/D 1.900

Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.

• Proven fatigue strength for extreme performance
• Chrome stems and hard tips enhance durability
• Exotic alloys for superior tensile strength, reliability, and longevity
• Swirl polishing and machined faces improved airflow/optimized efficiency