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.

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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 11/24/2025

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Estimated Ship Date: Monday 11/24/2025

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 11/24/2025

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Estimated Ship Date: Monday 11/24/2025

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: Jan 6, 2026 if ordered today

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Estimated Ship Date: Jan 6, 2026 if ordered today

Manley Severe Duty Series Stainless Steel Valves 11904-1

Valve, Intake, NK-844 Stainless, 2.250 in. Diameter, .3085 in. Stem, 5.424 in. Length, Each

Part Number: MAN-11904-1

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

Manley Severe Duty Series Stainless Steel Valves 11813-1

Valve, Exhaust, XH-428 Stainless, 1.810 in. Diameter, .3415 in. Stem, 5.369 in. Length, Each

Part Number: MAN-11813-1

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

Manley Severe Duty Series Stainless Steel Valves 11904B-1

Valves, Intake, Stainless Steel, 2.250 in. Diameter, .309 in. Stem, 5.424 in. Length, 426 Hemi, Each

Part Number: MAN-11904B-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

Manley Severe Duty Series Stainless Steel Valves 11782-1

Valve, Intake, Stainless Steel, 2.020 in. Diameter, .371 in. Stem, 4.980 in. Length, Mopar, Each

Part Number: MAN-11782-1

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

Manley Severe Duty Series Stainless Steel Valves 11904-8

Valves, Intake, Stainless, 2.250 in. Diameter, 0.309 in. Stem, 5.424 in. Length, Dodge, 426 Hemi, Set of 8

Part Number: MAN-11904-8

Not Yet Reviewed

Estimated Ship Date: Monday 11/24/2025

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Estimated Ship Date: Monday 11/24/2025

Manley Severe Duty Series Stainless Steel Valves 11781-1

Valve, Exhaust, Stainless Steel, 1.600 in. Diameter, .371 in. Stem, 4.970 in. Length, Mopar, Each

Part Number: MAN-11781-1

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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