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Manley Extreme Duty Series Stainless Steel Valves

4.5 out of 5 stars 2 Customer Reviews

Manley Extreme Duty Series performance steel valves are a great choice for supercharged, alcohol-burning, or high-revving engines. These engines generate a lot of heat and require special valves that can handle that kind of punishment. All valves are made from the best stainless steel available, with chrome stems and hardened valve tips. Extreme Duty Series valves are swirl-polished and fully machined and available with either undercut heads or straight stems.

Results 1 - 20 of 20

Valves, Intake, Stainless Steel, 2.190 in. Diameter, .341 in. Stem, 5.344 in. Length, Chevy, Ford, Set of 8

Part Number: MAN-11822-8

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Valves, Intake, Stainless Steel, 2.250 in. Diameter, .372 in. Stem, 5.218 in. Length, Chevy, Set of 8

Part Number: MAN-11562-8

5.0 out of 5 stars ( 1 )

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Valve, Intake, Stainless Steel, 1.900 in. Diameter, 0.342 in. Stem, 5.522 in. Length, Chevrolet, Set of 8

Part Number: MAN-11739-1

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Estimated Ship Date: Jan 12, 2026 if ordered today

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Estimated Ship Date: Jan 12, 2026 if ordered today

Valves, Intake, Stainless Steel, 2.190 in. Diameter, .372 in. Stem, 5.218 in. Length, Chevy, Set of 8

Part Number: MAN-11520-8

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Estimated Ship Date: Jan 12, 2026 if ordered today

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Valve, Intake, Stainless Steel, 2.250 in. Diameter, .341 in. Stem, 5.244 in. Length, Chevy, Ford, Each

Part Number: MAN-11802-1

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Estimated Ship Date: Jan 12, 2026 if ordered today

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Estimated Ship Date: Jan 12, 2026 if ordered today

Valves, Intake, Stainless Steel, 2.190 in. Diameter, .341 in. Stem, 5.244 in. Length, Chevy, Ford, Set of 8

Part Number: MAN-11800-8

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Estimated Ship Date: Jan 12, 2026 if ordered today

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Valves, Intake, NK-844 Stainless Steel, 2.400 in. Diameter, .342 in. Stem, 6.680 in. Length, Set of 8

Part Number: MAN-11582-8

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Estimated Ship Date: Jan 12, 2026 if ordered today

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Valve, Intake, Stainless Steel, 2.250 in. Diameter, .372 in. Stem, 5.218 in. Length, Chevy, Each

Part Number: MAN-11562-1

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

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Valve, Intake, NK-844 Stainless, 2.300 in. Head Diameter, 5.433 in. Length, Chevy, Big Block, Each

Part Number: MAN-11536-1

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Estimated Ship Date: Jan 12, 2026 if ordered today

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Valve, Intake, Stainless Steel, 2.020 in. Diameter, .342 in. Stem, 5.140 in. Length, Each

Part Number: MAN-11544-1

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Estimated Ship Date: Jan 12, 2026 if ordered today

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Valve, Intake, Stainless Steel, 1.760 in. Diameter, .341 in. Stem, 5.167 in. Length, Ford, Each

Part Number: MAN-11801-1

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Estimated Ship Date: Jan 12, 2026 if ordered today

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Valve, Intake, Stainless Steel, 2.190 in. Diameter, .341 in. Stem, 5.344 in. Length, Chevy, Ford, Each

Part Number: MAN-11822-1

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Estimated Ship Date: Jan 12, 2026 if ordered today

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Valve, Intake, Stainless Steel, 2.300 in. Diameter, .341 in. Stem, 5.244 in. Length, Chevy, Each

Part Number: MAN-11780-1

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Estimated Ship Date: Jan 12, 2026 if ordered today

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Valves, Intake, Stainless Steel, 2.300 in. Diameter, .341 in. Stem, 5.244 in. Length, Chevy, Set of 8

Part Number: MAN-11780-8

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

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Valve, Intake, Stainless Steel, 1.900 in. Diameter, 0.342 in. Stem, 5.522 in. Length, Chevrolet, Set of 8

Part Number: MAN-11739-8

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Estimated Ship Date: Jan 12, 2026 if ordered today

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Estimated Ship Date: Jan 12, 2026 if ordered today

Valve, Intake, Stainless Steel, 2.190 in. Diameter, .341 in. Stem, 5.244 in. Length, Chevy, Ford, Each

Part Number: MAN-11800-1

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

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Estimated Ship Date: Jan 12, 2026 if ordered today

Valve, Intake, Stainless Steel, 2.190 in. Diameter, .372 in. Stem, 5.218 in. Length, Chevy, Each

Part Number: MAN-11520-1

Not Yet Reviewed

Estimated Ship Date: Jan 12, 2026 if ordered today

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Valve, Intake, NK-844 Stainless, 2.300 in. Diameter, .3720 in. Stem, 5.325 in. Length, Each

Part Number: MAN-11530-1

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Estimated Ship Date: Jan 12, 2026 if ordered today

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VALVE-Subaru WRX R/F 37mm

Part Number: MAN-11140-1

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Estimated Ship Date: Jan 12, 2026 if ordered today

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VALVE-Subaru WRX R/F 37mm

Part Number: MAN-11140-8

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Estimated Ship Date: Jan 12, 2026 if ordered today

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