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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 35

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

Part Number: MAN-12330-1

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VALVE-S/D 2.150,+.600

Part Number: MAN-11766-1

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VALVE-S/D 2.300,+.200

Part Number: MAN-11784-1

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Estimated Ship Date: Jan 12, 2026 if ordered today

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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

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Estimated Ship Date: Jan 12, 2026 if ordered today

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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

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Estimated Ship Date: Jan 12, 2026 if ordered today

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

Part Number: MAN-11554-1

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Estimated Ship Date: Jan 12, 2026 if ordered today

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

Part Number: MAN-11570-1

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

Part Number: MAN-11772-1

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

Part Number: MAN-11824-1

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

Part Number: MAN-11827-1

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

Part Number: MAN-11832-1

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Valve, Intake, Stainless Steel, 2.020 in. Diameter, .341 in. Stem, 4.911 in. Length, Chevy, Each

Part Number: MAN-11830-1

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VALVE-S/D 2.080,+.100

Part Number: MAN-11712-1

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Valve, Intake, Stainless Steel, 2.065 in. Diameter, .372 in. Stem, 5.218 in. Length, Each

Part Number: MAN-11836-1

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Valve, Exhaust, Stainless Steel, 1.880 in. Diameter, .371 in. Stem, 5.374 in. Length, Chevy, Each

Part Number: MAN-11831-1

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

Part Number: MAN-11823-1

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VALVE 2 0L

Part Number: MAN-11820-1

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VALVE-SB CHRY R/M 1.625

Part Number: MAN-11783-1

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Valve, Exhaust, Stainless Steel, 1.725 in. Diameter, .371 in. Stem, 5.374 in. Length, Chevy, Each

Part Number: MAN-11835-1

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Valves, Intake, Stainless Steel, 1.930 in. Diameter, .3133 in. Stem, 5.232 in. Length, LS 5.3L, Set of 8

Part Number: MAN-12358-1

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

Part Number: MAN-11738-1

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Valve, SBC intake, 2.080 +.300 Pro Flo, set of 8

Part Number: MAN-11740-1

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Valves, Intake, XH-428 Stainless, 2.080 in. Head Diameter, 4.874 in. Length, Chevy, 5.7, 6.0L, Set of 8

Part Number: MAN-11682-1

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Valves, VALVE-S/D 1.600,+.600

Part Number: MAN-11359-1

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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

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Estimated Ship Date: Jan 12, 2026 if ordered today

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