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Manley Severe Duty Pro Flo Series Stainless Steel Valves 11686H-1
Part Number: MAN-11686H-1
Manley Severe Duty Pro Flo Series Stainless Steel Valves
Valves, Intake, XH-428 Stainless Steel, 2.165 in. Diameter, .313 in. Stem, 4.900 in. Length, Chevy, Each
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Estimated Ship Date: Oct 26, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
11686H-1
Part Type:
Product Line:
Summit Racing Part Number:
MAN-11686H-1
UPC:
807298042886
Valve Position:
Intake
Intake Valve Head Diameter (in.):
2.165 in.
Intake Valve Head Diameter (mm):
54.991 mm
Intake Valve Stem Diameter (in.):
0.313 in.
Intake Valve Stem Diameter (mm):
7.95mm
Intake Overall Valve Length (in.):
4.900 in.
Intake Overall Valve Length (mm):
124.460mm
Undercut Stem:
Yes
Swirl-Polished:
Yes
Valve Tip Length (in.):
0.160 in.
Valve Tip Length (mm):
4.064mm
Valve Material:
XH-428 stainless steel
Lock Groove Quantity:
1-groove
Lock Groove Style:
Conventional
Approximate Weight (g):
118
Valve Head Style:
7 degree dish
Valve Seat Width (in.):
0.100 in.
Quantity:
Sold individually.
Notes:
Hollow stem.
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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