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Manley Chevrolet Big Block Exhaust Valve Kit - 1.940in Head Dia. 5.422in O/A Length, 0.3415in Stem

(Excluding Injectors) For Non Continental USA or International Shipping on ECUs and some other items, Please contact us directly to get an accurate quote for your order.

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  • This is a SPECIAL ORDER item and availability can vary, please contact us for an accurate timeframe of availability before purchase. Some items can take 30+ days from manufacturer to become available.***ANY SPECIAL ORDER PLACED WITHOUT CONTACTING US FIRST IS SUBJECT UP TO A 10% CANCELLATION FEE***

  • Manufacturer Part Number: 11803-8
  • Save $100.35
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  • WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects. PROP65 INFO
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.