Manley Performance 12347-8 Manley Chevy LT-1 6.2L 1.590in Head Diameter Pro Flo/Severe Duty Exhau – EuroPartShop
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Manley Performance 12347-8
Manley Chevy LT-1 6.2L 1.590in Head Diameter Pro Flo/Severe Duty Exhaust Valves (Set of 8)

Free Ground Shipping to USA (Lower 48)

2 sold in last 8 days
12347-8
MAN12347-8
In stock
Valves
$401.42 $306.01
4 interest-free payments or as low as $76.50/mo with Shop Pay 4 installments. Prequalify now
Manley Performance - 12347-8 Valves
Manley Severe Duty® Valves deliver the ultimate in strength, reliability,...
$306.01
Shop Pay 4 installments
Free Gound Shipping to Continental USA

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.

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