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  • Manley Chevrolet Big Block Exhaust Valve Kit - 1.900in Head Dia. 6.380in O/A Length, 0.3415in Stem
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Manley Chevrolet Big Block Exhaust Valve Kit - 1.900in Head Dia. 6.380in O/A Length, 0.3415in Stem

Manley Performance
MAN11581-8
In stock
Valves
$401.42 $301.07
Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme...
$301.07

Manley Chevrolet Big Block Intake Valve Kit - 2.400in Head Dia. 6.600in O/A Length, 0.3415in Stem
Manley Chevrolet Big Block Intake Valve Kit - 2.400in Head Dia. 6.600in O/A Length, 0.3415in Stem
$415.30 $311.48
Manley Chevrolet Small Block Exhaust Valve Kit - 1.625in Head Dia. 5.221in O/A Length, 0.3415in Stem
Manley Chevrolet Small Block Exhaust Valve Kit - 1.625in Head Dia. 5.221in O/A Length, 0.3415in Stem
$401.42 $301.07
Manley Chevrolet Big Block Exhaust Valve Kit - 1.900in Head Dia. 6.380in O/A Length, 0.3415in Stem
Description
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.
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