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Manley Severe Duty Pro Flo Series Stainless Steel Valves

5.0 out of 5 stars 5 Customer Reviews

Manley Severe Duty Pro Flo Series intake and exhaust valves are a great choice for your high performance or race engine. All valves are made from stainless steel (intakes are NK-844; exhausts are XH-428) with chrome stems and hardened valve tips. Severe Duty series valves are fully machined and swirl polished, and offer improved flow with undercut "Pro Flo" stems. Many size options are available, for applications from 1955 and up.

Results 1 - 25 of 62

Valves, Intake, Stainless Steel, 2.165 in. Diameter, 0.313 in. Stem, 4.900 in. Length, Set of 8

Part Number: MAN-11686-8

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 11/24/2025

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Estimated Ship Date: Monday 11/24/2025

Valves, Intake, Stainless Steel, 2.205 in. Diameter, 0.313 in. Stem, 5.200 in. Length, Chevy, Set of 8

Part Number: MAN-11688-8

Not Yet Reviewed

Estimated Ship Date: Monday 11/24/2025

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Estimated Ship Date: Monday 11/24/2025

Valves, Intake, Stainless Steel, 2.080 in. Diameter, .341 in. Stem, 5.011 in. Length, Chevy, Set of 8

Part Number: MAN-11772-8

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valves, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 5.036 in. Length, Chevy, Set of 8

Part Number: MAN-11823-8

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valves, Exhaust, Stainless Steel, 1.880 in. Diameter, .371 in. Stem, 5.374 in. Length, Chevy, Set of 8

Part Number: MAN-11831-8

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valves, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 4.936 in. Length, Chevy, Set of 8

Part Number: MAN-11827-8

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valves, Intake, Stainless Steel, 2.140 in. Diameter, .312 in. Stem, 5.135 in. Length, Each

Part Number: MAN-12330-1

Not Yet Reviewed

Estimated Ship Date: Monday 11/24/2025

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Estimated Ship Date: Monday 11/24/2025

VALVE-S/D 2.150,+.600

Part Number: MAN-11766-1

Not Yet Reviewed

Estimated Ship Date: Monday 11/24/2025

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Estimated Ship Date: Monday 11/24/2025

VALVE-S/D 2.300,+.200

Part Number: MAN-11784-1

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valves, Intake, NK-844 Stainless, 2.065 in. Diameter, .3720 in. Stem, 5.218 in. Length, Set of 8

Part Number: MAN-11836-8

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valves, Intake, Stainless Steel, 2.205 in. Diameter, 0.313 in. Stem, 5.200 in. Length, Chevy, Set of 8

Part Number: MAN-11688-1

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valves, Exhaust, XH-428 Stainless Steel, 1.600 in. Diameter, 0.342 in. Stem, 5.255 in. Length, Set of 8

Part Number: MAN-11703-1

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valves, Intake, XH-428 Stainless Steel, 2.165 in. Diameter, .313 in. Stem, 4.900 in. Length, Chevy, Set of 8

Part Number: MAN-11686H-1

Not Yet Reviewed

Estimated Ship Date: Jan 7, 2026 if ordered today

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Estimated Ship Date: Jan 7, 2026 if ordered today

Valves, Exhaust, XH-428 Stainless Steel, 1.600 in. Diameter, 0.342 in. Stem, 5.255 in. Length, Set of 8

Part Number: MAN-11703-8

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valve, Intake, NK-844 Stainless Steel, 2.065 in. Diameter, .372 in. Stem, 5.325 in. Length, Chevy, Each

Part Number: MAN-11554-1

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valve, Intake, Stainless Steel, 2.300 in. Diameter, .372 in. Stem, 5.513 in. Length, Chevy, Each

Part Number: MAN-11570-1

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valve, Intake, Stainless Steel, 2.080 in. Diameter, .341 in. Stem, 5.011 in. Length, Chevy, Each

Part Number: MAN-11772-1

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

VALVE-S/D 2.080,+.400

Part Number: MAN-11764-8

Not Yet Reviewed

Estimated Ship Date: Monday 11/24/2025

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Estimated Ship Date: Monday 11/24/2025

Valve, Intake, Stainless Steel, 2.065 in. Diameter, .372 in. Stem, 5.325 in. Length, Set of 8

Part Number: MAN-11554-8

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valves, Intake, Stainless Steel, 2.020 in. Diameter, .341 in. Stem, 4.911 in. Length, Chevy, Set of 8

Part Number: MAN-11830-8

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valves, Intake, NK-844 Stainless Steel, 2.020 in. Diameter, 0.342 in. Stem, 5.250 in. Length, Set of 8

Part Number: MAN-11702-8

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valves, Intake, NK-844 Stainless, 2.080 in. Diameter, .3415 in. Stem, 5.111 in. Length, Set of 8

Part Number: MAN-11738-8

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valve, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 4.936 in. Length, Chevy, Each

Part Number: MAN-11827-1

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Valve, Intake, Stainless Steel, 2.055 in. Diameter, .341 in. Stem, 5.011 in. Length, Chevy, Each

Part Number: MAN-11824-1

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

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

Part Number: MAN-11832-1

Not Yet Reviewed

Estimated Ship Date: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

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