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Part number: 11131-8
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Product Details
Manley 11131-8 Valvetrain
Products specifications
Head Diameter 31mm
Margin .065"
Notes For K20A2 engines.
O/A Length 109.04mm
Overall Valve Length (in) 4.291 in.
Overall Valve Length (mm) 109.0mm
Quantity Sold as a set of 8.
Seat Width .080"
Stem Diameter 5.5mm/.2165”
Swirl Polished Yes
Swirl-Polished Yes
Tip Length 2.08mm
Top of Head 20° Dish
Undercut Stem No
Underhead Angle/Radius 25° x 11/32"
Valve Head Diameter (in) 1.220 in.
Valve Head Diameter (mm) 31.0mm
Valve Head Style 20 degree dish
Valve Material XH-426 stainless steel
Valve Seat Width (in) 0.080 in.
Valve Stem Diameter (in) 0.217 in.
Valve Stem Diameter (mm) 5.5mm
Valve Tip Length (in) 0.082 in.
Valve Tip Length (mm) 2.08mm
Race Series Valves
Set of 8

Manley Performance Sport Compact stainless steel valves utilize our exceptional Race Series alloy and are manufactured to the highest quality standards.

Manley valves are designed to outflow and outperform all others even in the most severe environments. Manley stainless valves feature gorgeous yet durable chrome stems, swirl polished under heads, fully hardened tips, completely machined combustion faces, closely controlled margin heights, and exact stem to seat concentricity to render a finished product that is unsurpassed.

Manley intake valves typically are built with our original Pro-Flo design which reduces the stem diameter in the fillet area for increased airflow but also less valve weight.

In certain specific applications, Manley offers our Extreme Duty exhaust material. Our Extremealloy alloy offers more hot hardness and high temperature strength than our competitors offerings. This alloy is ideal for extremely high boosted applications where the exhaust gas temperatures reach what seem like unthinkable levels.

Manley stainless valves are suitable for all applications ranging from the mild street performer to the jaw dropping 1000+ horsepower race cars competing at the drag strip or drifting events.

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I was very skeptical of ordering from Autoplicity, as I've never heard of them.  They had everything I needed in stock and shipped very quickly, and for a much better price than my normal suppliers at Jegs and Summit Racing.   I would recommend them to everyone...............Jeff
Lowest prices around, fast to ship. I will be back.
great so far
Very friendly customer service! They also shipped my radiator out very quickly. I will definetly be ordering from autoplicity again!
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