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.

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Manley Severe Duty Pro Flo Series Stainless Steel Valves 12330-1

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

Manley Severe Duty Pro Flo Series Stainless Steel Valves 11703-1

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

Manley Severe Duty Pro Flo Series Stainless Steel Valves 11703-8

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

Manley Severe Duty Pro Flo Series Stainless Steel Valves 11702-8

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

Manley Severe Duty Pro Flo Series Stainless Steel Valves 11783-1

VALVE-SB CHRY R/M 1.625

Part Number: MAN-11783-1

Not Yet Reviewed

Estimated Ship Date: Monday 11/24/2025

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Estimated Ship Date: Monday 11/24/2025

Manley Severe Duty Pro Flo Series Stainless Steel Valves 11549-1

Valve, Exhaust, Stainless Steel, 1.600 in. Diameter, .371 in. Stem, 5.075 in. Length, Mopar, Each

Part Number: MAN-11549-1

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 Pro Flo Series Stainless Steel Valves 11549-8

Valves, Exhaust, Stainless Steel, 1.600 in. Diameter, .371 in. Stem, 5.075 in. Length, Mopar, Set of 8

Part Number: MAN-11549-8

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

Manley Severe Duty Pro Flo Series Stainless Steel Valves 11550-1

Valve, Intake, Stainless Steel, 2.020 in. Diameter, .372 in. Stem, 5.050 in. Length, Mopar, Each

Part Number: MAN-11550-1

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 Pro Flo Series Stainless Steel Valves 11702-1

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

Part Number: MAN-11702-1

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 Pro Flo Series Stainless Steel Valves 11550-8

Valves, Intake, Stainless Steel, 2.020 in. Diameter, .372 in. Stem, 5.050 in. Length, Mopar, Set of 8

Part Number: MAN-11550-8

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

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