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Manley

Manley Severe Duty Series Stainless Steel Valves

4.94 out of 5 stars 17 Customer Reviews

Manley Severe Duty series performance 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 made of superior materials, are fully machined and swirl polished, and are available with either undercut "Pro Flo" stems or straight stems.

Showing In Stock Items. Show All 242 Items.

Results 1 - 25 of 198

Manley Severe Duty Series Stainless Steel Valves 11843-8

Manley Severe Duty Series Stainless Steel Valves 11843-8

Manley Severe Duty Series Stainless Steel Valves 11843-8

Valves, Exhaust, Stainless Steel, 1.880 in. Diameter, .341 in. Stem, 5.422 in. Length, Chevy, Set of 8

Part Number: MAN-11843-8

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11850-8

Manley Severe Duty Series Stainless Steel Valves 11850-8

Manley Severe Duty Series Stainless Steel Valves 11850-8

Valves, Intake, Stainless Steel, 2.250 in. Diameter, .341 in. Stem, 5.344 in. Length, Chevy, Set of 8

Part Number: MAN-11850-8

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11854-8

Manley Severe Duty Series Stainless Steel Valves 11854-8

Manley Severe Duty Series Stainless Steel Valves 11854-8

Valves, Intake, Stainless Steel, 2.300 in. Diameter, .341 in. Stem, 5.494 in. Length, Chevy, Set of 8

Part Number: MAN-11854-8

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11815-8

Manley Severe Duty Series Stainless Steel Valves 11815-8

Manley Severe Duty Series Stainless Steel Valves 11815-8

Valves, Exhaust, Stainless Steel, 1.880 in. Diameter, .341 in. Stem, 5.522 in. Length, Chevy, Set of 8

Part Number: MAN-11815-8

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11661-8

Manley Severe Duty Series Stainless Steel Valves 11661-8

Manley Severe Duty Series Stainless Steel Valves 11661-8

Valve, Race, XH-426 Stainless Steel, Exhaust, 1.590 in. Diameter, 4.923 in. Length, Set of 8

Part Number: MAN-11661-8

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11813-8

Manley Severe Duty Series Stainless Steel Valves 11813-8

Manley Severe Duty Series Stainless Steel Valves 11813-8

Valves, Exhaust, XH-428 Stainless, 1.810 in. Diameter, .3415 in. Stem, 5.369 in. Length, Set of 8

Part Number: MAN-11813-8

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11854-1

Manley Severe Duty Series Stainless Steel Valves 11854-1

Manley Severe Duty Series Stainless Steel Valves 11854-1

Valve, Intake, Stainless Steel, 2.300 in. Diameter, .341 in. Stem, 5.494 in. Length, Chevy, Each

Part Number: MAN-11854-1

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11539-1

Manley Severe Duty Series Stainless Steel Valves 11539-1

Manley Severe Duty Series Stainless Steel Valves 11539-1

Valve, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 5.036 in. Length, Chevy, Each

Part Number: MAN-11539-1

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11782-8

Manley Severe Duty Series Stainless Steel Valves 11782-8

Manley Severe Duty Series Stainless Steel Valves 11782-8

Valves, Intake, Stainless Steel, 2.020 in. Diameter, .371 in. Stem, 4.980 in. Length, Mopar, Set of 8

Part Number: MAN-11782-8

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11539-8

Manley Severe Duty Series Stainless Steel Valves 11539-8

Manley Severe Duty Series Stainless Steel Valves 11539-8

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

Part Number: MAN-11539-8

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

Manley Severe Duty Series Stainless Steel Valves 11843-1

Manley Severe Duty Series Stainless Steel Valves 11843-1

Manley Severe Duty Series Stainless Steel Valves 11843-1

Valve, Exhaust, Stainless Steel, 1.880 in. Diameter, .341 in. Stem, 5.422 in. Length, Chevy, Each

Part Number: MAN-11843-1

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11802-8

Manley Severe Duty Series Stainless Steel Valves 11802-8

Manley Severe Duty Series Stainless Steel Valves 11802-8

Valves, Intake, Stainless Steel, 2.250 in. Diameter, .341 in. Stem, 5.244 in. Length, Chevy, Ford, Set of 8

Part Number: MAN-11802-8

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

Manley Severe Duty Series Stainless Steel Valves 11543-8

Manley Severe Duty Series Stainless Steel Valves 11543-8

Manley Severe Duty Series Stainless Steel Valves 11543-8

Valves, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 4.911 in. Length, Chevy, Set of 8

Part Number: MAN-11543-8

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11826-8

Manley Severe Duty Series Stainless Steel Valves 11826-8

Manley Severe Duty Series Stainless Steel Valves 11826-8

Valves, Intake, Stainless Steel, 2.020 in. Diameter, .341 in. Stem, 5.026 in. Length, Chevy, Set of 8

Part Number: MAN-11826-8

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

Manley Severe Duty Series Stainless Steel Valves 11856-8

Manley Severe Duty Series Stainless Steel Valves 11856-8

Manley Severe Duty Series Stainless Steel Valves 11856-8

Valves, Intake, Stainless Steel, 2.250 in. Diameter, .341 in. Stem, 5.494 in. Length, Chevy, Set of 8

Part Number: MAN-11856-8

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11878-8

Manley Severe Duty Series Stainless Steel Valves 11878-8

Manley Severe Duty Series Stainless Steel Valves 11878-8

Valves, Intake, Stainless Steel, 2.300 in. Diameter, .341 in. Stem, 5.610 in. Length, Chevy, Set of 8

Part Number: MAN-11878-8

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11815-1

Manley Severe Duty Series Stainless Steel Valves 11815-1

Manley Severe Duty Series Stainless Steel Valves 11815-1

Valve, Exhaust, Stainless Steel, 1.880 in. Diameter, .341 in. Stem, 5.522 in. Length, Chevy, Each

Part Number: MAN-11815-1

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11880-1

Manley Severe Duty Series Stainless Steel Valves 11880-1

Manley Severe Duty Series Stainless Steel Valves 11880-1

Valves, Intake, NK-844, 2.350 in. Diameter, 0.342 in. Stem, 5.610 in. Length, Chevy, Set of 8

Part Number: MAN-11880-1

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11596-8

Manley Severe Duty Series Stainless Steel Valves 11596-8

Manley Severe Duty Series Stainless Steel Valves 11596-8

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

Part Number: MAN-11596-8

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Manley Severe Duty Series Stainless Steel Valves 11745-8

Manley Severe Duty Series Stainless Steel Valves 11745-8

Manley Severe Duty Series Stainless Steel Valves 11745-8

Valve, Exhaust, Stainless Steel, 1.900 in. Diameter, .342 in. Stem, 5.422 in. Length, Set of 8

Part Number: MAN-11745-8

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

Manley Severe Duty Series Stainless Steel Valves 11763-8

Manley Severe Duty Series Stainless Steel Valves 11763-8

Manley Severe Duty Series Stainless Steel Valves 11763-8

Valves, Exhaust, XH-428 Stainless, 1.625 in. Diameter, .3415 in. Stem, 5.565 in. Length, Set of 8

Part Number: MAN-11763-8

Not Yet Reviewed

Estimated Ship Date: Dec 30, 2025 if ordered today

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Estimated Ship Date: Dec 30, 2025 if ordered today

Manley Severe Duty Series Stainless Steel Valves 11844-8

Manley Severe Duty Series Stainless Steel Valves 11844-8

Manley Severe Duty Series Stainless Steel Valves 11844-8

Valves, Intake, Stainless Steel, 2.080 in. Diameter, .341 in. Stem, 5.026 in. Length, Chevy, Set of 8

Part Number: MAN-11844-8

Not Yet Reviewed

Estimated Ship Date: Dec 30, 2025 if ordered today

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Estimated Ship Date: Dec 30, 2025 if ordered today

Manley Severe Duty Series Stainless Steel Valves 11751-8

Manley Severe Duty Series Stainless Steel Valves 11751-8

Manley Severe Duty Series Stainless Steel Valves 11751-8

Valves, Exhaust, Stainless Steel, 1.600 in. Diameter, .341 in. Stem, 5.165 in. Length, Chevy, Set of 8

Part Number: MAN-11751-8

Not Yet Reviewed

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

Manley Severe Duty Series Stainless Steel Valves 11503-6

Manley Severe Duty Series Stainless Steel Valves 11503-6

Manley Severe Duty Series Stainless Steel Valves 11503-6

Valves, Exhaust, Stainless Steel, 1.500 in. Diameter, .342 in. Stem, 4.725 in. Length, Buick V6, Set of 6

Part Number: MAN-11503-6

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

Manley Severe Duty Series Stainless Steel Valves 11781-8

Manley Severe Duty Series Stainless Steel Valves 11781-8

Manley Severe Duty Series Stainless Steel Valves 11781-8

Valves, Exhaust, Stainless Steel, 1.600 in. Diameter, .371 in. Stem, 4.970 in. Length, Mopar, Set of 8

Part Number: MAN-11781-8

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

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