Manley Chevrolet Small Block 2.080 Head .3415 Stem Severe Duty Pro Flo Intake Valve - Single - 11772-1

Proven Fatigue Tests: The Severe Duty? Valves have undergone rigorous fatigue tests. In normal operation, valves experience 20,000 to 25,000 lbs of applied stress. When valves bounce on the seat, this stress soars to 40,000 to 60,000 lbs. Manley exhaust...

Manley Chevrolet Small Block 2.165in Head .3133in Stem Severe Duty Pro Flo Intake Valve - Single - 11620-1

Stainless Steel Construction: Both exhaust (XH-426) and intake (NK-842) valves are constructed from high-quality stainless steel for unparalleled durability.Chrome Stems and Hard Tips: Chrome stems and hard tips are incorporated for enhanced longevity...

Manley Chevrolet Small Block Severe Duty Exhaust Valves 1.500in Head Dia .3415in Stem - Set of 8 - 11747-8

Proven Fatigue Tests: The Severe Duty? Valves have undergone rigorous fatigue tests. In normal operation, valves experience 20,000 to 25,000 lbs of applied stress. When valves bounce on the seat, this stress soars to 40,000 to 60,000 lbs. Manley exhaust...

Manley Chevy Big Block .100 Longer 11/32in Stem Dia Extreme Duty & Marine Intake Valves (Set of 8) - 11842-8

Proven Fatigue Tests: The Severe Duty? Valves have undergone rigorous fatigue tests. In normal operation, valves experience 20,000 to 25,000 lbs of applied stress. When valves bounce on the seat, this stress soars to 40,000 to 60,000 lbs. Manley exhaust...

Manley Chevy Big Block .250 Longer 11/32in Stem Dia Severe Duty Intake Valves (Set of 8) - 11854-8

Proven Fatigue Tests: The Severe Duty? Valves have undergone rigorous fatigue tests. In normal operation, valves experience 20,000 to 25,000 lbs of applied stress. When valves bounce on the seat, this stress soars to 40,000 to 60,000 lbs. Manley exhaust...

Manley Chevy Big Block 2.190in Head Dia 5.344in OAL 5 Deg. Dish Race Master Intake Valves (Set of 8) - 11894-8

Stainless Steel Construction: Both exhaust (XH-426) and intake (NK-842) valves are constructed from high-quality stainless steel for unparalleled durability.Chrome Stems and Hard Tips: Chrome stems and hard tips are incorporated for enhanced longevity...

Manley Chevy Big Block Chevy 1.880in Severe Duty Exhaust Valves - 12843-8

Proven Fatigue Tests: The Severe Duty? Valves have undergone rigorous fatigue tests. In normal operation, valves experience 20,000 to 25,000 lbs of applied stress. When valves bounce on the seat, this stress soars to 40,000 to 60,000 lbs. Manley exhaust...

Manley Chevy Big Block Stock 3/8 inch Severe Duty Intake Valves (Set of 8) - 11562-8

Proven Fatigue Tests: The Severe Duty? Valves have undergone rigorous fatigue tests. In normal operation, valves experience 20,000 to 25,000 lbs of applied stress. When valves bounce on the seat, this stress soars to 40,000 to 60,000 lbs. Manley exhaust...

Manley Chevy Big Block Street Flo Intake Valves 2.250in Head Dia - 10726-8

High-Quality Stainless Steel: Our Street Series valves, available as XH-424 for exhaust and NK-841 for intake, are crafted from top-grade stainless steel, ensuring durability and longevity.Chrome Stems and Hard Tips: These valves feature chrome stems and...

Manley Chevy L83 5.3L 1.560in Head Diameter Pro Flo/Extreme Duty Exhaust Valves (Set of 8) - 12363-8

Ideal for Specialized Applications: Tailored for any application where extreme force and heat resistance is a must including Top Fuel, Funny Car, and Marine Engine applications.XH-432 XtremeAlloy: The hallmark of excellence in exhaust valve material...

Manley Chevy L83 5.3L 1.560in Head Diameter Pro Flo/Severe Duty Exhaust Valve (Set of 8) - 12361-8

Proven Fatigue Tests: The Severe Duty? Valves have undergone rigorous fatigue tests. In normal operation, valves experience 20,000 to 25,000 lbs of applied stress. When valves bounce on the seat, this stress soars to 40,000 to 60,000 lbs. Manley exhaust...

Manley Chevy L83 5.3L 1.560in Head Diameter Pro Flo/Severe Duty Exhaust Valve (Single) - 12361-1

Proven Fatigue Tests: The Severe Duty? Valves have undergone rigorous fatigue tests. In normal operation, valves experience 20,000 to 25,000 lbs of applied stress. When valves bounce on the seat, this stress soars to 40,000 to 60,000 lbs. Manley exhaust...