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Manley Severe Duty Pro Flo Series Stainless Steel Valves 11831-1
Part Number: MAN-11831-1
Manley Severe Duty Pro Flo Series Stainless Steel Valves
Valve, Exhaust, Stainless Steel, 1.880 in. Diameter, .371 in. Stem, 5.374 in. Length, Chevy, Each
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Estimated Ship Date: Apr 24, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
11831-1
Part Type:
Product Line:
Summit Racing Part Number:
MAN-11831-1
UPC:
807298053523
Valve Position:
Exhaust
Exhaust Valve Head Diameter (in.):
1.880 in.
Exhaust Valve Head Diameter (mm):
47.752mm
Exhaust Valve Stem Diameter (in.):
0.371 in.
Exhaust Valve Stem Diameter (mm):
9.42mm
Exhaust Overall Valve Length (in.):
5.374 in.
Exhaust Overall Valve Length (mm):
136.410mm
Undercut Stem:
Yes
Swirl-Polished:
Yes
Valve Tip Length (in.):
0.220 in.
Valve Tip Length (mm):
5.588mm
Valve Material:
XH-428 stainless steel
Lock Groove Quantity:
1-groove
Lock Groove Style:
Conventional
Approximate Weight (g):
132
Valve Head Style:
5 degree dish
Valve Seat Width (in.):
0.100 in.
Quantity:
Sold individually.
Manley Severe Duty Pro Flo Series Stainless Steel Valves
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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