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Manley Severe Duty Pro Flo Intake Valve

(2008-2014 Subaru WRX)

Manufacturer

Picture for manufacturer Manley

Part Number

Multiple - see below for details
9 reviews
Sale Price

from $37.64

In Stock (10+)

delivery box

Usually delivered within 2 days

free shipping

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Product Details

The Manley Severe Duty Pro Flo Intake Valve is a high-performance stainless steel engine intake valve built for race and high-output street engines. The Severe Duty series is one of Manley's signature product lines. Each valve is fully machined and swirl polished, with an undercut "Pro Flo" stem shape that improves airflow into the cylinder.

Key Features:

  • NK-844 stainless steel intake material for strength and fatigue resistance at high temperatures
  • Undercut "Pro Flo" stem and underhead profile to improve port flow
  • Chrome-plated stems for wear resistance and smooth operation in the valve guide
  • Hardened valve tips for durability under high valvetrain loads
  • Swirl-polished, fully machined finish for consistent quality

Manley Severe Duty Pro Flo valves suit performance and racing builds where airflow and durability matter. They are a good choice for engine builders upgrading a cylinder head or building a new performance engine. Each part number in this product line has its own specifications. Check the details for your chosen item.

Products specifications

Fits

2008-2014 Subaru WRX

Select yours to see vehicle-specific options.

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2 items

Picture of Manley 11686-1 Severe Duty Pro Flo Intake Valve 2.165 LS3 L92
Representative Photo. Actual item may vary
Manley 11686-1 Severe Duty Pro Flo Intake Valve 2.165 LS3 L92
Description
Specifications
Approximate Weight (g)118
Lock Groove Quantity1-groove
Lock Groove StyleConventional
NotesUnderhead angle/radius 12 x .375 in. Margin 0.055 in.
Overall Valve Length (in)4.900 in.
Overall Valve Length (mm)124.460mm
QuantitySold individually.
Swirl-PolishedYes
Undercut StemYes
Valve Head Diameter (in)2.165 in.
Valve Head Diameter (mm)54.991mm
Valve Head Style7 degree dish
Valve MaterialNK-842 stainless steel
Valve Seat Width (in)0.100 in.
Valve Stem Diameter (in)0.313 in.
Valve Stem Diameter (mm)7.950mm
Valve Tip Length (in)0.160 in.
Valve Tip Length (mm)4.060mm
$37.64
PART NUMBER: 11686-1
In Stock (10+)
Usually delivered within 2 days
Picture of Manley 12352-1 Severe Duty Pro Flo Intake Valve Chevy LT1 6.2L 2.120" Diameter
Representative Photo. Actual item may vary
Manley 12352-1 Severe Duty Pro Flo Intake Valve Chevy LT1 6.2L 2.120" Diameter
Description
$38.93
PART NUMBER: 12352-1
In Stock (10+)
Usually delivered within 2 days

Select & Customize

Easy website to use. Price was on point, checking shipping was easy.

quick and easy.

User friendly site and fast shipping!

Good description of product, answered questions.

on time, box arrived a little beat up, i have not opened yet, waiting for mechanic

Item as described, arrived when expected.

We were thrilled to receive it so quickly and it was just a few hrs before we left on a 800 mile trip with it. The ride was much smoother than the previous trip changing from 600 lb bars to 1000 ln.

Excellent in every aspect

Great!

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