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  • Make/Engine
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  • Exhaust Valve Head Diameter (in.)
  • Intake Valve Head Diameter (mm)
  • Exhaust Valve Head Diameter (mm)
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  • Exhaust Valve Stem Diameter (in.)
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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.

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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: Tomorrow

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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: Jan 12, 2026 if ordered today

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Estimated Ship Date: Jan 12, 2026 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: Jan 12, 2026 if ordered today

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Estimated Ship Date: Jan 12, 2026 if ordered today

Manley Severe Duty Series Stainless Steel Valves 11591-8

Manley Severe Duty Series Stainless Steel Valves 11591-8

Manley Severe Duty Series Stainless Steel Valves 11591-8

Valve, Exhaust, Severe Duty, Stainless Steel, 1.880 in. Diameter, 0.342 in. Stem, 5.655 in. Length, Set of 8

Part Number: MAN-11591-8

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